Answer:
Flat as a leaf round as a ring. I have two eyes but can't see a thing.
Deep, deep, do they go. Spreading out as they go. Never needing any air. They are sometimes as fine as hair.
I shrink smaller every time I take a bath.
What is easy to get into, but hard to get out of?
Pronounced as one letter but written with three always in evil never in good and always in zebra never in animal. What is it?
Special abilities and brightly colored underwear are all you need to be one of these.