Zios was Mira's pet pancake who co-founded Jamma along with her. Their affection soon grew for each other and they became lovers. They lived together in peace, harmony, and all that other Disney stuff. They ruled Jamma until Phantoms came and destroyed the land, rendering him and Mira deceased.
The End.

tl;dr he's a pancake.

He's also Shrek's father in disguise.

The "Animal Jam Experts" over at the Animal Jam Wiki think they have an article about Zios.