mother may I?
permissions
Backtagging: No problem! Poke me if I don't reply because I might have forgotten. I have the most terrible memory ever.
Threadhopping: No problem here either. As long as you don't steal a thread that looks like it was going somewhere/developing some good CR by kicking me or my thread partner out completely.
Fourthwalling: If you have one of those characters that can infomod canon information (like, say, Travis Touchdown from NMH), go ahead and make jokes about it. If they seem to know too much about Zell, though (i.e. his family, childhood, other things he wouldn't normally tell the whole world), he'd probably be pretty upset about it. Just run the idea by me if you wanna do this and aren't sure about it!
Offensive subjects: I really don't care. I mean, very little actually offends me. So you're probably good. Again, ask if you aren't sure.
Hugging: Is welcome! It might catch him a little bit off guard if it's out of nowhere/from someone he just met, but he won't mind it.
Kissing: Zell would probably get pretty flustered and try to back away unless he has a crush on your character or something (note that he already canonly has a crush on the Library Girl in FF8), so don't expect him to kiss back otherwise.
Flirting: On the other hand, a little bit of harmless flirting is a-okay with him. He might flirt back if he feels like it. Note that I say harmless flirting - overt sexual advances or anything of that nature would probably do nothing but embarrass him and make him try to avoid your character for a bit.
Fighting: Now that's something Zell can live with. He doesn't go out of his way to start them, but Zell doesn't really mind being in fights. He's pretty good at fighting, though, so don't expect him to go easy on you - he's got one hell of a mean right hook and is rather well-versed in martial arts and hand-to-hand combat.
Injuring: Sure! Feel free to say your character punched him, scratched him, cut him, etc. But please ask if it's extensive injury/breaking a bone/a wound deep enough to need stitches/anything else that would require him to have a stay in the infirmary.
Killing: I'd be willing to talk it out with you and see how we could make this work. Just ask first, please.
Mind-reading: Pretty much the same as fourth-walling. Yes, but if it's something private or touchey, he'll probably get all 8|. Ask if you aren't sure, as always!