There is no "for keeps" here... you know that as well as I do... [It's a shitty club to be in and they are both in it.]

But no... I don't think he would kill you. Not without some extreme outside influence. He is trying to change from what he was in their world, and I think he has made progress to that end--but that doesn't make him a nice person. He can be callous and uncaring, even purposefully hurtful. It is best for you to avoid him. I doubt you will ever even see him, but so you are aware, he looks exactly like Vash but his hair is black and cut shorter.