The lights are on
Personally i would go with the medium it is what you start out with . Instead of telling you why to go with the medium im going to tell you why not to go with the others.
heavy- one advantage more health not much more health though. disadvantages slow-ness hey fat albert , Lose some weight you cant jump two feet seriously.
light-most people think this type is the best but alas i have to be the bearer of bad news no it isnt extremely low health.sure he can run but he cant reaily wall hop its about the same climbing abilities as the medium.
medium-excellent amount of health , pretty fast ,can jump anything over anything as high as head over all the best