What Are The Best Undertale AU Christmas Party Fanfics?

2026-04-23 13:22:27 85

5 Answers

Jack
Jack
2026-04-24 06:06:50
For fluff lovers, 'Under the Tree’ is pure serotonin: a human-monster gift exchange where Undyne and Alphys build a DIY light show, Grillby serves festive cocktails, and Napstabloop drops cryptic but accurate predictions about everyone’s New Year’s resolutions. The pacing’s brisk, but it captures that ‘found family’ vibe the fandom adores.
Kate
Kate
2026-04-27 13:25:16
‘How the Grinch Stole Underground’ sounds gimmicky, but it’s shockingly heartfelt. A post-pacifist Frisk deals with post-Christmas blues until the gang recreates the holiday in July. Highlights include Asgore wearing a Santa hat over his horns and Temmie selling ‘yule log’ doodles. The prose is simple, but the character voices are spot-on—especially Flowey’s reluctant participation.
Xena
Xena
2026-04-27 20:38:46
I binged 'Carol of the Bells' last winter—a musical AU where monsters reinterpret human carols (Muffet’s ‘Eight-legged Nights’ is iconic). What starts as a silly sing-along spirals into a competition between Sans and Mettaton for ‘best performance,’ judged by a very done Papyrus. The author weaves in lyrics and stage directions like a Broadway script, and the ending with everyone singing ‘Silent Night’ in monster language is oddly moving.
Dana
Dana
2026-04-27 23:12:43
Ohhh, Christmas-themed 'Undertale' AUs are such a cozy rabbit hole! One of my favorites is 'Snowdin Holiday Hijinks,' where Sans tries (and fails) to organize a secret Santa for the skeleton brothers, leading to Papyrus accidentally gifting everyone spaghetti ornaments. The writing nails the humor and warmth of the original game, plus there’s a sweet subplot where Frisk convinces Toriel to host the party at the ruins.

Another gem is 'Mistletoe Misadventures,' a Chara-centric fic where they’re resurrected as a ghost and haunt the party, playing pranks until Flowey—of all people—helps them reconnect with Asriel through old holiday traditions. The emotional payoff had me tearing up while laughing at the chaos. Bonus points for the author including a recipe for 'Butterscotch-Cinnamon Pie' in the notes!
Emilia
Emilia
2026-04-28 18:55:36
If you’re into rare AUs, 'Gaster’s Frosty Return' is a hidden treasure. It imagines the scientist stumbling into a monster holiday celebration post-core meltdown, completely baffled by modern traditions. The dialogue is gold—especially his deadpan reactions to Sans’ puns—and the art snippets scattered throughout make it feel like a visual novel. It’s short but packs in hilarious moments, like Alphys teaching him how to use a ‘selfie stick’ with Mettaton.
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