Reos appear as enemies in Smash Run. Similarly to their appearence in their home series, the swoop down on the player and try to claw the them.
These clawed, fly-like enemies from Metroid show up in Smash Run, too. They float in midair, then fly in a U shape when you get close. They're predictable, which makes them easy to outsmart, but stay on your toes anyway--their attacks can send you flying. One way to beat them is to grab and throw when they buzz near you.