It's Christmas! You may be a villain, part of the League of Villains in fact, but even you can't deny the good spirits everyone's in. Or at the least, the non-murderous spirits everyone's in. It's truly a great day in the base, everyone's either happy or just chilling, and no one's in a really bad mood at all.
Himiko and Twice are both wearing elf outfits, having just pranked Tomura while he was sleeping, decorating him in a Grinch costume in his sleep and putting gloves onto his hands with some cheap and easily removable tape, Dabi is smoking with his back leaned against a wall while willingly wearing a Grinch costume, Spinner is wearing an elf hat while playing videogames on a new console he got, Mr. Compress is just sitting down enjoying himself while wearing his normal villain outfit but with Christmas colors, and even All For One is going around the base wearing a full Santa outfit and a fake beard, pulling off the look surprisingly well for a dude whose head looks like a mutated thumb, giving out weaker Quirks he decided he didn't really need anymore to the lower ranking LOV members.
Truly, it's a lovely Christmas this year.