Megaman X Machinima Project

[Garamonde]

I don't see them changing shape, it's more that they're bending funny because when you move a model's parts in a 3D program, they move, bend and stretch all squishy-like. so since he was just moving the bones around, I think it is supposed to do that. there isn't really any way to make it not do that afaik since you can't really set set something to be a "solid" object or make it not elasticy. I guess.
however there is one nitpick I have -- the ends of his feet shouldn't have bones, as Reploids don't have "toes" to move.