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2020s 2021 2boys 2d animated animated_gif birthday black_pants blinking blue_jacket brothers cape carrying carrying_person chimo_(utdt_game) dated digital_media english_text flag floating_cape gloves happy_birthday humanoid jacket male male_only monster monster_boy pants papyrus_(undertale) red_cape red_gloves sans_(undertale) siblings simple_background skeleton striped striped_pants text undead undertale white_stripes 1boy 1other 2020s 2022 2d ambiguous_gender animated animated_gif birthday black_pants blue_jacket blue_shirt boots brown_hair chimo_(utdt_game) digital_media english_text frisk_(undertale) gift gift_box happy_birthday human humanoid jacket male monster monster_boy pants sans_(undertale) short_hair shorts simple_background skeleton striped striped_pants striped_shirt text undead undertale white_stripes 1boy 1other 2020s 2022 2d ambiguous_gender animated animated_gif birthday black_pants blue_jacket blue_shirt bone boots brown_hair candle chimo_(utdt_game) digital_media dog english_text frisk_(undertale) happy_birthday heart human humanoid jacket male monster monster_boy pants sans_(undertale) short_hair shorts simple_background skeleton striped striped_pants striped_shirt text undead undertale white_stripes 1girl 1other 2020s 2022 2boys 2d ambiguous_gender anthro black_pants blue_shorts brothers brown_hair cape character_print christmas christmas_sweater digital_media dragonartdraw female floppy_ears frisk_(undertale) fur furry furry_female gloves goat goat_ears goat_girl goat_horns green_socks green_sweater hands_on_own_hips hands_together horns human humanoid long_sleeves male mammal merry_christmas monster monster_boy monster_girl oversized_clothes pants papyrus_(undertale) profanity red_cape red_gloves sans_(undertale) short_hair shorts siblings skeleton sleeves_past_wrists socks spread_arms striped striped_pants sweater text toriel turtleneck turtleneck_sweater undead undersized_clothes undertale white_fur white_horns white_stripes 1girl 1other 2020s 2022 2boys 2d ambiguous_gender anthro black_pants blue_shorts brothers brown_hair character_print christmas christmas_sweater digital_media english_text female floppy_ears frisk_(undertale) full_body fur furry furry_female gloves goat goat_ears goat_girl goat_horns green_sweater hand_on_own_hip headpat horns human humanoid long_sleeves male mammal monster monster_boy monster_girl oversized_clothes pants papyrus_(undertale) poetax red_gloves red_scarf sans_(undertale) scarf short_hair shorts siblings simple_background skeleton sleeves_past_wrists speech_bubble standing striped striped_pants sweater tapping_foot text thumbs_up toriel turtleneck turtleneck_sweater undead undersized_clothes undertale white_background white_fur white_horns white_stripes 1boy 1girl 2010s 2016 2d alphys anthro black_hair boots digital_media dinosaur dinosaur_girl duo english_text female glasses gloves hair_over_one_eye height_difference high_heel_boots hug humanoid ian621_(u6cj8482621) kneeling lizard lizard_girl lizard_tail male mettaton mettaton_ex monster monster_girl outside_border pink_background reptile reptile_girl reptile_tail robot robot_boy sad scalie short_hair tears text thank_you two-tone_background undertale white_background yellow_skin 2010s 2016 2d alphys ambiguous_gender animal anthro arachnid arthropod arthropod_girl asgore_dreemurr asriel_dreemurr beard black_hair black_pants blonde_hair blue_jacket blue_shirt blue_shorts blue_skin boots brothers brown_hair cape chara_(undertale) chibi copyright_name cousins digital_media everyone facial_hair father_and_son female fish fish_girl floppy_ears flower food frisk_(undertale) furry furry_female furry_male ghost gloves goat goat_boy goat_ears goat_girl goat_horns green_shirt hair_over_one_eye high_heel_boots holding holding_food horns hot_dog human humanoid ian621_(u6cj8482621) jacket ketchup_bottle knife lizard lizard_girl lizard_tail long_hair male mammal mettaton mettaton_ex monster monster_boy monster_girl monster_kid_(undertale) mother_and_son muffet muffet's_pet multiple_arms multiple_boys multiple_eyes multiple_girls multiple_others napstablook pants papyrus_(undertale) pasta phone pie pink_stripes plant purple_skin red_cape red_gloves red_hair reptile reptile_girl reptile_tail robot robot_boy sans_(undertale) scalie short_hair shorts siblings simple_background skeleton snail spaghetti spear speech_bubble spider spider_girl striped striped_pants striped_shirt text toriel undead undertale undyne weapon white_background white_fur white_horns white_stripes yellow_skin 1other 2020s 2024 2d ambiguous_gender black_background blue_shirt brown_hair chibi copyright_name dark_background digital_media frisk_(undertale) full_body human short_hair simple_background solo striped_shirt text tuku_rugk undertale 1boy 2020s 2023 2024 2d back black_background blue_shorts boots cape chibi copyright_name dark_background digital_media full_body gloves humanoid long_gloves looking_at_viewer looking_back male male_focus male_only monster monster_boy papyrus_(undertale) red_boots red_cape red_gloves shorts simple_background skeleton solo text tuku_rugk undead undertale 1boy 2020s 2023 2024 2d black_background black_pants blue_jacket chibi copyright_name dark_background digital_media drawstring full_body grey_hood hood hood_down hooded_jacket humanoid jacket male male_focus male_only monster monster_boy pants sans_(undertale) simple_background skeleton slippers solo text tuku_rugk undead undertale 2020s 2024 2boys 2d black_background black_pants blue_jacket blue_shorts brothers cape chibi copyright_name dark_background digital_media drawstring duo english_text full_body gloves grey_hood hands_on_own_hips hood hood_down hooded_jacket humanoid jacket male male_only monster monster_boy pants papyrus_(undertale) red_cape red_gloves sans_(undertale) shorts siblings simple_background skeleton slippers text tuku_rugk typo undead undertale 1boy 2020s 2024 2d black_background black_pants blue_jacket chibi copyright_name dark_background digital_media drawstring full_body grey_hood hood hood_down hooded_jacket humanoid jacket male male_focus male_only monster monster_boy pants sans_(undertale) simple_background skeleton slippers solo text tuku_rugk undead undertale 2020s 2023 2boys 2d artist_name black_background black_pants blue_jacket blue_shorts brothers cape chromatic_aberration copyright_name dark_background digital_media drawstring duo english_text film_grain full_body gloves grey_hood hands_up holding hood hood_down hooded_jacket humanoid jacket long_gloves male male_only monster monster_boy one_eye_closed pants papyrus_(undertale) red_cape red_gloves sans_(undertale) shorts siblings simple_background skeleton slippers spread_arms striped striped_pants text tuku_rugk twitter_username typo undead undertale white_stripes 2020s 2023 2boys 2d black_background black_pants blue_jacket blue_shorts brothers cape chromatic_aberration copyright_name crossed_arms dark_background digital_media drawstring english_text film_grain full_body gloves grey_hood hand_on_own_knee hood hood_down hooded_jacket humanoid jacket long_gloves male male_only monster monster_boy one_eye_closed pants papyrus_(undertale) red_cape red_gloves sans_(undertale) shorts siblings simple_background skeleton slippers squatting striped striped_pants text tuku_rugk undead undertale white_stripes 2020s 2022 2boys 2d brothers cape car commentary convertible digital_media driving duo english_text foreshortening gloves humanoid male male_only monster monster_boy motor_vehicle one_eye_closed papyrus_(undertale) pointing pointing_forward red_cape red_car red_gloves sakito_(mg_1016) sans_(undertale) siblings simple_background skeleton speech_bubble star_(symbol) text undead undertale upper_body vehicle 2020s 2022 2boys 2d 3girls alphys anthro arm_around_neck black_pants blue_jacket brothers cape digital_media female fish fish_girl floppy_ears fur furry furry_female goat goat_ears goat_girl goat_horns hair horns humanoid jacket lizard lizard_girl long_hair male mammal monster monster_boy monster_girl multiple_boys multiple_girls one_eye_closed pants papyrus_(undertale) pink_slippers red_cape red_hair reptile reptile_girl sakito_(mg_1016) sans_(undertale) scalie shorts siblings skeleton slippers striped striped_pants text toriel undead undertale undyne walking white_fur white_horns white_stripes 2020s 2022 2boys 2d artist_name black_background black_pants blue_jacket blue_shorts bone brothers cape copyright_name dark_background digital_media duo english_text foreshortening gloves holding holding_bone humanoid jacket looking_at_viewer male male_only monochrome monster monster_boy outstretched_arm pants papyrus_(undertale) red_cape red_gloves sakito_(mg_1016) sans_(undertale) shorts siblings simple_background skeleton striped striped_pants text undead undertale white_stripes 1boy 2020s 2023 2d artist_name black_pants blue_jacket digital_media drawstring full_body gloves hand_in_pocket hand_up humanoid jacket korokor59513559_(style) male male_only monster monster_boy pants parody pink_slippers romaji_text sakito_(mg_1016) sans_(undertale) simple_background skeleton slippers solo striped striped_pants style_parody text undead undertale white_stripes 1other 2020s 2022 2boys 2d ambiguous_gender artist_name black_pants blue_jacket blue_shorts brothers brown_hair cape character_print christmas christmas_sweater digital_media duo english_text frisk_(undertale) gloves green_sweater hand_on_own_chin human humanoid jacket long_sleeves male monster monster_boy open_mouth oversized_clothes pants papyrus_(undertale) red_cape red_gloves sakito_(mg_1016) sans_(undertale) short_hair shorts siblings skeleton sleeves_past_wrists speech_bubble spoken_ellipsis striped striped_pants sweater text turtleneck turtleneck_sweater undead undersized_clothes undertale white_stripes 1boy 2020s 2022 2d artist_name blue_flower blue_rose boots cape closed_mouth copyright_name digital_media english_text feet_out_of_frame flower gloves half-closed_eyes holding humanoid long_gloves lying male male_only monster monster_boy on_stomach papyrus_(undertale) petal plant red_boots red_cape red_gloves rose sakito_(mg_1016) skeleton solo text undead undertale yellow_flower blush boots fanart floating honeeeeeey lag_seeing looking_at_viewer looking_away midair niche_(tegami_bachi) night_sky standing_on_one_leg steak_(tegami_bachi) tegami_bachi text wind 111papilio 1girl green_eyes green_hair hatsune_miku parody radiohead_(band) reflection text twintails vocaloid 2girls animal fire_emblem fire_emblem:_three_houses holding_hands horse horseback_riding knight marianne_von_edmund mercedes_von_martritz riding_animal star tamafry text 2020s 2023 2d 3boys 8gilol anthro asriel_dreemurr black_pants blue_jacket cute digital_media english_text floppy_ears flower flower_wreath flowey_(undertale) full_body fur furry furry_male goat goat_boy goat_ears green_eyes green_shirt hand_on_own_head head_wreath holding holding_flower humanoid jacket kneeling looking_at_viewer male male_only mammal monster monster_boy pants plant sakekuzu_no_ame sans_(undertale) simple_background skeleton spoilers striped striped_pants text trio twitter_username undead undertale white_background white_body white_fur white_stripes wreath yellow_flower 1boy 2020s 2023 2d 8gilol artist_name artist_signature blue_jacket commentary digital_media english_text full_body hands_in_pockets hashtag_commentary humanoid jacket japanese_commentary long_jacket male male_only monster monster_boy pink_footwear pink_slippers running sakekuzu_no_ame sans_(undertale) shorts signature simple_background skeleton slippers solo striped striped_shorts talking text twitter_username undead undertale white_background !? 1boy 2020s 2023 2d animal annoying_dog artist_name black_pants blue_jacket couch cushion digital_media dog duo eris_nemesis furniture humanoid indoors jacket japanese_text licking licking_another's_cheek licking_another's_face male male_focus male_only monster monster_boy pants pillow sans_(undertale) signature skeleton socks striped striped_pants surprised sweat tail tail_wagging text tongue tongue_out undead undertale white_dog white_socks white_stripes 1boy 2020s 2023 2d arm_up artist_name black_pants blue_jacket couch cushion digital_media english_text eris_nemesis furniture hand_up humanoid indoors jacket looking_at_viewer male male_focus male_only monster monster_boy pants pillow pink_slippers sans_(undertale) signature skeleton slippers socks solo striped striped_pants text undead undertale white_socks white_stripes 2010s 2015 2boys 2d arms_up black_pants blue_jacket blue_slippers brothers cape christmas commentary digital_media duo english_commentary english_text gasterblaster gloves glowing glowing_eye happy_holidays humanoid jacket male male_only monster monster_boy pants papyrus_(undertale) pine_tree red_cape red_gloves sack sans_(undertale) shorts siblings skeleton skull sleigh snow snowflakes subzero-ryukami text tree undead undertale 2010s 2017 2boys 2d alternate_costume boots brothers carrying carrying_person christmas digital_media duo english_text fake_elf_ears gasterblaster gift gift_box gloves hat humanoid male male_only monster monster_boy outstretched_arm pants papyrus_(undertale) red_background red_nose sans_(undertale) santa_costume santa_hat siblings simple_background size_difference skeleton skull speech_bubble sunglasses symphysins text undead undertale white_gloves 2010s 2016 2boys 2d boots brothers christmas christmas_lights digital_media english_text gift gift_box gloves green_sweater hat humanoid male merry_christmas mikotoazure monster monster_boy pants papyrus_(undertale) red_scarf sans_(undertale) santa_hat scarf siblings skeleton sleeves_past_fingers sweater text two-tone_background undead undertale upper_body yellow_sweater 1boy 2010s 2015 2d black_pants candy_cane christmas christmas_lights digital_media english_text fur_trim gift gift_box gradient_background happy_holidays huelux humanoid jacket lying male male_only merry_christmas monster monster_boy on_back one_eye_closed pants red_jacket sack sans_(undertale) simple_background skeleton solo text undead undertale 1boy 2010s 2016 2d christmas cute digital_media drawstring english_text fur_trim humanoid index_finger_raised jacket looking_at_viewer male male_only merry_christmas monster monster_boy red_jacket sans_(undertale) santa_costume santa_hat shionbluu skeleton snow solo sweater text turtleneck undead undertale upper_body white_sweater 1girl abs arcane:_league_of_legends biting_own_lip blue_hair gun holding_gun holding_weapon jinx_(league_of_legends) league_of_legends one_eye_closed pink_background pink_eyes pink_smoke retrotheartist smoke tattoo text twin_braids weapon 1boy 2020s 2023 2d black_background blue_shorts bone cape chromatic_aberration closed_mouth copyright_name dark_background digital_media film_grain gloves holding holding_bone humanoid long_gloves male male_only monster monster_boy one_eye_closed papyrus_(undertale) red_cape red_gloves shorts simple_background skeleton solo sparkle text tuku_rugk undead undertale upper_body 1boy 2020s 2023 2d black_background blue_shorts bone cape closed_mouth copyright_name cowboy_shot dark_background digital_media gloves glowing hand_on_own_hip holding holding_bone humanoid long_gloves male male_only monster monster_boy one_eye_closed orange_eye papyrus_(undertale) red_cape red_gloves shorts simple_background skeleton solo text tuku_rugk undead undertale 2boys arcane:_league_of_legends glowing jayce_(league_of_legends) league_of_legends poreyneel text viktor_(league_of_legends) 1boy 1other 2020s 2024 2d ambiguous_gender artist_name black_background black_hair cousins digital_media english_text frankenstein's_monster_(cosplay) ghost gloves hair_over_one_eye halloween happy_halloween hat humanoid male mettaton mettaton_ex napstablook robot robot_boy short_hair simple_background soto_(pixiv_id_100623867) sparkle tears text tongue tongue_out top_hat twitter_username undertale 2020s 2024 2boys 2d ? anthro armor artist_name blush border character_name digital_media dragon dragon_boy dragon_horns english_text food fur furry furry_male green_body green_eyes green_scales green_skin holding holding_food holding_ice_cream holding_ice_cream_cone horns ice_cream ice_cream_cone looking_at_another looking_away male male_only monster monster_boy nosebleed orange_body orange_eyes orange_fur pink_background rabbit rabbit_boy rabbit_ears royal_guard_01_(undertale) royal_guard_02_(undertale) scales scalie soto_(pixiv_id_100623867) sweat sweating_profusely text topless topless_male twitter_username undertale upper_body yellow_border 1boy 1other 2010s 2016 2d 9koma ambiguous_gender artist_name child comic digital_media embarrassed english_text flower flowey_(undertale) frisk_(undertale) holding holding_phone human ko-on_(ningen_zoo) male male_only monochrome phone photobomb plant selfie short_hair smile speech_bubble striped_shirt taking_picture tall_image text undertale 2010s 2016 2d ambiguous_gender animal annoying_dog anthro artist_name blue_shirt brown_hair child closed_mouth digital_media dog english_text frisk_(undertale) ghost green_body grey_hair hand_on_own_forehead heart human jerry_(undertale) ko-on_(ningen_zoo) lizard lizard_tail monster monster_kid_(undertale) napstablook open_mouth reptile reptile_tail scalie short_hair simple_background stacking striped_shirt tall_image temmie text too_many undertale white_body white_dog white_fur yellow_background 1boy 2020s 2023 2d artist_name blue_background blue_jacket character_name digital_media english_text eris_nemesis full_body hands_in_pockets hood hood_down hooded_jacket humanoid jacket long_jacket looking_at_viewer male male_only monster monster_boy outline pants pink_pants pink_slippers sans_(undertale) signature simple_background skeleton slippers socks solo striped striped_pants text undead undertale upside-down white_outline white_socks white_stripes 1boy 2020s 2023 2d arm_on_knee artist_name black_pants blue_background blue_jacket character_name digital_media english_text eris_nemesis full_body hood hood_down hooded_jacket humanoid indian_style jacket looking_at_viewer male male_only monster monster_boy outline pants pink_slippers sans_(undertale) signature simple_background sitting skeleton slippers socks solo striped_pants text undead undertale white_outline white_socks