Backtagging:
Please, absolutely. I live for this.
Threadhopping:
This too. Feel free to use my post to hop on other characters when you need to! I know when to disable notifs and all that.
Fourthwalling:
Preferably not. Komaeda has too many secrets I'd rather not get out even by joking about his personality.
Offensive subjects (elaborate):
Komaeda himself is offensive. Don't worry about it.

Hugging this character:
Sure.
Kissing this character:
Yeah.
Flirting with this character:
Go for it.
Fighting with this character:
If you really have to.
Injuring this character (include limits and severity):
Again, if you really have to. How injured is up to discussion.
Killing this character:
Ask me, please.
Using telepathy/mind reading abilities on this character:
Not at all without permission, sorry.