On the surface, Shrek is a big, green, ogre who lives in a swamp. He's not very social and he doesn't like people. But as you get to know Shrek, you realize that there's more to him than meets the eye.
Shrek has a heart of gold. He's kind, caring, and compassionate. He's also very loyal and protective of his friends. Shrek is a true friend and ally, and he's always there for the people he cares about.
Shrek is also very funny. He has a great sense of humor, and he's always making jokes. Shrek is a great person to be around, and he always makes people laugh.
So, Shrek is like an onion because he has layers. There's more to him than meets the eye, and he's a great person to know.