Aliens from the animated movie Planet 51 are green humanoids with antennas.
Most of them like Peggy Sue, Lem's Parents, Neera and Eckle's Parents, The Reporter, and many others are used only as background characters and/or side characters in the movie, as well as the video game tie-in. Some even have speaking roles while others don't.
Some have noses while others are noseless. Some have hair while others are bald. The females wear dresses and/or skirts while the males have the "Donald Duck" no pants look.