3D game character design

Came up with some ideas for the 3D game I am creating. The sketches are all simple and mostly based on simple shapes like cubes and spheres. Kept it simple to focus on animating the character after it is modeled. The most likely ideas on the page are below

None of the characters have legs or feet that would be animated in a walk cycle because it would waste time. If I went with the second option I could make a way for the player to control the two parts that detach or just use this to make the animation more interesting.