Backtagging: Backtagging is fine.
Threadhopping: Yes for casual threads. Ask for serious threads.
Fourthwalling: No.
Offensive subjects: None.

Hugging this character: Sure.
Kissing this character: Same as above.
Flirting with this character: Please do.
Fighting with this character: Yes.
Injuring this character: Yes, but please plan anything involving torture or maiming with me first.
Killing this character: No thanks.
Using telepathy/mind reading abilities on this character: Ask first.