3. Lrrr, Futurama
Hear us out here: the ruler of Omicron Persei 8 (Maurice LaMarche) is a big, blustery horned space alien. But underneath the cape, Lrrr is really just your average middle-aged, disgruntled husband and father. He'd rather sit at home watching television than actually do any planetary invading, and he's already had one mid-life crisis. Lrrr's rants are always entertaining, and he's for the most part pretty harmless. But his sheer size would also dissuade anyone who wanted to give us an attitude.