Threadhopping with this character?: Sure! Unless it's a private thread.
Hugging this character?: Go for it, this kid is all about free hugs and happy times.
Giving this character a kiss?: Haha, yeah if you want to just don't expect him to kiss back, he'll be confused as to why you gave it to him at all! Unless you're Yubel.
Badtouching: Lots of stiffness, glaring, and walking away.
Lovers: He's in a relationship with Yubel (and Johan if you think about it.), should anything happen otherwise I love to plot romances!
Punching this character (provided they can fight back): If you punch him, depending on the character, he'll either look stunned and not fight back or if you punch him he'll punch back more then once.
Is there anything you do not want mentioned near this character?: ICly, not really. OOCly NO YU-GI-OH ABRIDGED JOKES, GX ABRIDGED OR OTHERWISE.
Easiest way to get on his good side: Just be friendly and smile, he'll do the same for you.
Easiest Way To Get on his Bad Side: Insult/threaten his friends or those he cares about.
Can I Hack his Journal?: Sure just don't do it /all/ the time.
Can he Hack my Journal?: No, he doesn't know crap about hacking, he's not a genius.
Fourth Wall Breakage: Probably not, the kid is sensitive about certain things and no one wants to make someone so adorable cry.
Can I shapeshift/bodyswap/etc?: Bodyswap...ehh if it's not an event no, shapeshift, if you can do it, go for it.
Maim/Murder/Death: Give me a fantastical reason then yes. Probably a plot leading up to it would be best.
Blood: It's cool, just not too much to where it's fatal unless that's a part of a plot where he dies.