I'm trying to remember some anime from my childhood:

- First there was one about a boxer. I remember he wanted to be the champ and killed some guy in the arena and couldn't hit anyone in the head because of it for a while

- The other one was about 3 guys who travelled from the future to stop some event.
I think they were staying in the home of a chick they first met in the present.
The main guys was able to transform into some sort of mecha/bio weapon.
I think his friends could transform too but they were only lvl 1 and he was lvl 3 or something like that

Anyone care to help me with this one?