-Threadhopping with this character - yes, no, or what?: Do what you want, doesn't bug me at all. Just make sure it's not really serious business before you decide to just throw yourself in. <<;
-Hugging this character?: Uh...well, you could, but depending on the situation it might not be a great idea. If you catch him by surprise, he might end up throwing you to the ground. <<;
-Giving this character a kiss?: Oh now that could be gloriously awkward. If you don't mind handling a very confused Snake, then...well, take your chances, is all.
-Punching this character (provided they are given an opportunity to fight back): Snake invented CQC, he's no stranger to a fight. He's sure not going to let you get away with hitting him, so if you're aiming for a fight, go for it.
-Is there anything YOU DO NOT WANT MENTIONED near this character?: Nah, it's all good.
-Is there anything you need us to KNOW about interacting with this character? Special physical features, fighting abilities, STUFF: Though all of the display pictures don't show it, Snake is missing his right eye (it was lost via gunshot).
As far as fighting, Snake's not superhuman, and against a lot of characters he's not going to have much of a chance. Against anyone with power in the range of a normal human, though, Snake can hold his own thanks to an overdose of military expertise and training. Also, guns.
-ANYTHING ELSE PLEASE MENTION HERE: If you have any giant robots, just...watch out. <<