At the end of Happy Feet, Erik looks similar to Mumble's hatchling look, but lacks his bow tie and has Gloria's brown eyes.
He may or may not be Erik or maybe another chick.
In Happy Feet Two, Erik appears to be the smallest emperor penguin chick in Emperor-Land. He has short messy hair, blue eyes and a bow tie like Mumble.
Erik is naturally shy. He is never seen fully participating, successfully at least, with the other penguins' dances. Because he is shy, usually lets Bo or Atticus do the talking, but will occasionally say a few words. He has apparently been known to get frustrated and not know how to calm himself. When he meets Sven, he looks to him as his hero, then notices that Mumble is his true hero.
Erik cares for his friends and loves his parents.