Backtagging: I will backtag for a long time.
Threadhopping: Yep.
Fourthwalling: Sure.
Offensive subjects: There isn't a lot that offends me. If it comes up, I'll say something.

Hugging this character: Sure, but he won't be happy about it.
Kissing this character: Yeah, probably not. Mika does not like to do the kissing thing.
Flirting with this character: Go for it, though he won't flirt back.
Fighting with this character: Definitely! He's got some sword skills and can even do some hand-to-hand stuff if necessary.
Injuring this character: Oh yes. I'll even go for limb dismemberment with him.
Killing this character: Let's plot, but I'm open to it.
Using telepathy/mind reading abilities on this character: It can happen.
Abilities/Warnings: Mika is not very friendly... with anyone. Sorry, it's nothing to do with you and everything to do about his personality. He does have a soft spot for children though. Also, as a vampire he does need to drink blood but I'd prefer it if he didn't drink human blood so randomly. In canon, he's resisted for the last four years so he's pretty good at saying no and doesn't trust the people who'd give it to him easily. If your character is something else not human - he might try their blood. And depending on how long he goes, he may attack them without warning to get it. I will always ask first though.