My idea is Titans that have more extremes than what we have now. I mean a chassis that is only twice or one and a half times as big as a person but is really really fast and can jump (like a reaper); and a Titan that is just enormous (I mean like twice or three times any other titan) and is unbelievable slow but is just ridiculous. Now imagine things like smaller Titans rodeoing the enormous Titan and pilots crawling around on the giant one (fighting on platforms around it etc). I just think it would be really surreal and crazy, probably not a great idea balance wise though.