Tails: "Sonic, where are you going? It's Christmas Eve!"
Sonic: "Don't you worry, I'll be back in a flash! I just gotta drop off a few things!"
Sonic doesn't really answer people when they ask if he celebrates the holidays, but then he doesn't really answer much about himself anyway so they just take it as normal.
The guy has been known to be seen rushing around near Christmas Day, carrying a big brown bag, and with a Chao or two dressed in reindeer antlers following him. If asked what he's up to when doing so, he'll just tap the side of his nose and run away.
There's always a small, plainly wrapped gift waiting outside the doors of children nearby in the morning though!
I'm running out of punny titles XD You should be greatful.
edit: fixed the shading on his stomach and face because I forgot some of it XD
Other festive characters~