OOC
Backtagging: Yes!
Threadhopping: Sure, within reason.
Fourthwalling: Nah, not with this one.
Cross-canon: Of course!
Shipping: Sure!
Smutting:  DISCUSSION PLEASE FIRST.  I really prefer not to write out smut, but if it's a fade-to-black situation, that's more acceptable.  Close CR is a must.

IC
Hugging or kissing this character: GO FOR IT.
Flirting with this character: Sure.
Fighting with this character: Yes
Injuring this character: Yes, but no permanent damage please.
Killing this character: Probably not unless it's something we plan out beforehand.
Using telepathy/mind reading abilities on this character: Go ahead, nothing super invasive though please.