Backtagging: Always unless CR has progressed to a point where the thread is obsolete or old as dirt.
Threadhopping: I'm fine with it as long as my inbox isn't filled to the brim with comments that have nothing to do with Aragorn.
Fourthwalling: Sure, but such information always has consequences, so if you're unsure, feel free to message me on DW or Plurk.
Offensive subjects (elaborate): War and death are the big ones for him. If anything is graphic, I will label it.
Hugging this character: He might not seem like someone who enjoys hugs, but secretly he does.
Kissing this character: Cheek kisses are fine as long as it's kept friendly and not romantic.
Flirting with this character: Only if you want your character to be turned down gently.
Fighting with this character: Absolutely. He knows how to hold his own in battle and out (if we're talking verbal fights here).
Injuring this character (include limits and severity): I'd rather him not lose any limbs and/or die, but who knows where the journey leads.
Killing this character: We can discuss it.
Using telepathy/mind reading abilities on this character: This will equal him not trusting your character one iota if he finds out.