
Backtagging: Perfectly fine with this.
Threadhopping: I am okay with this.
Fourthwalling: Well...this was not really a comic before it became a movie. The most I could see would be somebody making a comparison with Akira.
Hugging this character: He is all for hugs. He embraces people and acts like a little kid sometimes. A hug from an interest? He becomes awkward as hell.
Kissing this character: Same as hug from an interested party? Even more awkward.
Flirting with this character: Did I mention how awkward he is? Yeah. Yeah that right there. if he is equally interested or just plain flustered then he will fail hardcore.
Fighting with this character: And this is where his real talent lies. He is a powerful telekinetic with the ability to mentally put a shield around his body to take impacts of all levels, use telekinesis on a variety of objects, fly, and so on. He does not want to fight you if he doesn't have to, but he will fight back to defend himself and others.
Injuring this character: He is a human being, so he does bleed. It is possible to catch him off-guard. Once he goes into fighting mode though, that is going to become very difficult to accomplish.
Killing this character: That would be difficult as he is resilient, but he is not immortal. Talk to me first and maybe we can work something out.
Using telepathy/mind reading abilities on this character: I will venture to say that reading his mind or telepathy in general will be met with resistance and an impossibility. He is, once again, a powerful telekinetic. This does not mean he can fight back with his own as he does not appear to display any abilities with this.
Hacking: He does not have any skill in hacking as far as I could tell. It is doubtful he would care about being hacked in the first place.