RANKED: (Edited 12/20)
Godlike:
Edelgard (christmas colors!)
Lamington (xmas angel!)
Goddess (FF6 religious figure, probably has her own holiday)
Chris Lightfellow (christmas colors!)
Kanon (christmas colors!)
Heavy:
Shadow (FF6 mercenary who probably hates holidays)
Geddoe (mercenary who definitely stopped celebrating holidays)
Olberic (basically a mercenary, but probably enjoys holidays)
Odie (mercenary who definitely likes holidays but pretends not to)
Lilka (JINGLE BELLS!~)
Middle:
Danette (christmas colors!)
Gordon (Defender of all Earth Holidays!)
Thursday (Programmed to bring holiday spirit BEEP BOOP)
Brad (WA2 he is definitely spending the holidays quietly with his boyfriend don't @ me)
Dedue (also spending his holiday time with boyfriend)
Light:
Vitali (ostensibly a cleric, but secretly a ninja... probably celebrates Ninja Xmas)
Locke (ostensibly a treasure hunter, but probably one of those types who spends a fortune on Xmas decorations)
Cyrus (OPT studying religious celebrations is absolutely fascinating!)
Marivel (probably actually Vampire Jesus)
Cotton (SaGaF, he's actually helping Santa pull his sleigh because it's foggy)
FUTURE RANKS:
Godlike:
Balmaint (SaGa SG) - Shockingly good at staying alive, including an all-important ID immunity. Has swing-y OHKO damage, some backup ID, and a number of tricks that spoil some of Godlike's favorite archetypes, like double-attacking speedsters. Also, he randomly does like 5x overkill damage to plants, so look out ExDeath.
Usalia (Disgaea 5) - Invincibility managed to get Elc into Godlike. Usalia's Invincibility is slightly better, but the rest of her kit is worse outside of having unique ID immunity.
Nisa (Disgaea 5) - An absolute OHKO machine with a unique autoheal limit option that only makes her stronger. Ridiculous by Disgaea 5 standards, but still locked to average turn speed and minimal status blocking options.
Marisa (Labyrinth of Touhou) - Jessica's Magic Burst, but Burstier!
Heavy:
Glenn (Chained Echoes) - Let's see what a solid slugger with a suite of debuffs and weakness-exposing skills can do!
Urpina (SaGa SG) - Not entirely sure on this ranking, but she spoils pretty much all physical damage dealers who can't swap weapons freely. Great speed, 2HKO damage, but she's also frail, and has to use her turns on those spoiling options if that's the strategy she's going with. Backup 20% ID against healers. If she's using her higher-cost skills every turn, she will eventually need to wait a turn to recharge her BP.
Temenos (Octopath 2) - Repping the Gay Octopath Boys! I kneejerk he might be a Middle, but with his starting night debuff spoiling his biggest worries on turn 1, he can probably get his game going in Heavy?
Flonne (Disgaea 5) - The Love Freak of Light, now with full status immunity (besides ID), near-limitless healing, and an Overload game to OHKO after stalling for long enough.
Byakuren (Labyrinth of Touhou) - A fun Heavy who builds up over time to be absolutely ridiculous~
Middle:
Ba'Thraz (Chained Echoes) - Telekinetic Lizard doing their best Fate Gilgamesh impression
Rosado (FE Engage) - Time for the queerest FE character to wreck havoc on all the boys in Middle
Mondo (SaGa SG) - Ridiculously tanky and good against anyone relying on evadable physicals. Let's see how SaGa Spear techs do in Middle~
Osvald (Octopath 2) - Repping the Gay Octopath Boys! Blast away with big magic damage and don't look back. He's slow so probably getting spoiled in Middle.
Emizel (Disgaea 5) - Plays an interesting back-and-forth game with his HP/SP resources where so long as he has one or the other, he can stay alive and keep spamming his 20% ID chances. Let's see how Middle handles that~
Light:
Amalia (Chained Echoes) - Hilarious healing game in Light. Bonus DOG nom!
Ivy (FE Engage) - ZAP!
Yunaka (FE Engage) - Zappy!
Seraphina (Disgaea 5) - Spoil some boys in Light~
Almaz (Disgaea 5) - Gets a damage boost when he's at low HP, and he deals crazy damage to 'Overlord-type' foes. That could be amusing in Light?