Mighty has a ground pound that can slam through stuff below him in the same way Knuckles can punch through things in front of him. Ray, as a flying squirrel, can glide - but unlike Knuckles' glide Ray can gain momentum in a dive and then pull up to gain height again. The closest analogy comes from Sonic's greatest rival - Ray's gliding works just like a sped-up version of the cape power up from Super Mario World. It's good stuff.