Fourthwalling: I prefer you didn't with Ichigo.
Touching, hugging, flirting, kissing... : Hugging from trusted friends is totally fine ( though Ichigo might be a bit awkward with it ) but he draws a definitive line between a friendly hug, and flirting. If Ichigo even thinks someone is flirting with him, he flusters, and backs off. Romance-wise, he is very much spoken for, and not interested in more.
Fighting, Injury, Killing: Shounen protagonist character means that Ichigo solves everything with fighting. Hell, he fights just for fun! He's also pretty ridiculously durable, so what should maim or significantly injure most humans won't slow him down as much. Contact me for any plotting regarding maiming, or potential character death, though.
Anything specific for this character? Ichigo has a sort of "sixth sense" in that he can detect the life energy ( reiatsu ) of others. He uses this like most people use ears to hear, or eyes to see - which is to say he does it automatically. If you're not comfortable with him "sensing" something about your character, let me know? Likewise for energy-sensitive characters, Ichigo will read as a rather dense, black and red colored nuclear reactor as far as energy goes.