I was actually thinking about this today while playing timbersaw. I had 2 ideas running through my head, either something warhammer 40k orc dreadnought like or something similar to Lagann from the anime Tengen Toppa Gurren Lagann.

OH wow, TTGL Timbersaw would be awesome! like that very first robot Simon found, and throwing his glasses as an ULT, just awesome

But what i actually ment is some elements from here:
http://images.wikia.com/armoredcore/images/1/1c/ArmoredCoreForAnswer-Redrum2.jpg
and there is a feature in Armored Core, called Boosters - when u use them - you fly or glide the surface instead of walking. That could be used as a haste rune or some max speed buffs (centaur ulti, for instance). Or if one makes an Armored Core courier at least - Boost can be used as a flying upgrade.

That's a rly good idea you have maby smbody should think about making those robotic sets for all heros, it would be cool and make them available all at the same time with new robotic tresure chests and keys, it would be just like a new exspansion :D