Threadhopping with this character?: Go ahead, I'll most likely go along with it.
Backtagging with this character?: Do it, make sure to PM me so I notice.
Hugging this character?: Expect him to flinch up for quite a while if you start doing this. He'll get comfortable with you eventually.
Giving this character a kiss?: Females only please, and expect him to almost lock up and try to back out of it unless you are around him a lot so he can get used to you.
(Something more intimate?): You trying to kill him? If he's not seeing anybody and you push hard enough, he'll agree. He takes a lot to warm up though, so you may wanna wait and get acquainted with him for a while before you try this.
(Relationships?): If he's not in one already, sure. He needs friends, and if he's single, he needs that one person he can depend on closely even more so. Expect a slow start to the romance.
Punching this character (provided they can fight back): If you fight with Enno, you'll probably get more than you bargained for, but sure. A little fistfight isn't going to hurt his feelings.
(Injury?): Go ahead. He heals well enough, but you'd better believe you won't walk away unscathed in return.
(Death?): I won't say this is impossible, but it will take more than most have to offer. In any case we have to talk about it.
Is there anything you do not want mentioned near this character?: Enno will basically handle almost everything well, but he dislikes talking about family.
Is there anything you need us to know about interacting with this character?: Enno does not use contractions when speaking unless he's having an extreme emotional state, such as being angry, or sharing a quiet moment with someone he's fallen in love with. Feel free to point out how robotic he seems. Other than that, nothing that's too shocking for you to not find out as you interact.
Anything else, please mention here: PM me with your questions?