Backtagging: Okay!
Threadhopping: Yep!
Fourthwalling: Sure?
Offensive subjects: I'm generally okay with anything, but if it's something seriously offending perhaps PMing beforehand is a good idea!

Hugging this character: Yep!
Kissing this character: Knock yourself out
Flirting with this character: Ye
Fighting with this character: sure
Injuring this character : I don't mind
Killing this character: Hmm I'll pass on this generally, depending on the situation.
Using telepathy/mind reading abilities on this character: Yes!