[GoldenXtreme]

My take on Vice is that he is definitely a firm ally now, even if he is still very impulsive. On the other hand, earlier on in the show before he had his character development, he would act quite malicious towards anyone who wasn't Ikki so I'm willing to bet his initial contract with Ikki as a kid had some nasty strings attached. At this point the real question is what exactly he was up to back then and why he hasn't explained in more detail.