What would a Down syndrome Ben 10 alien be called?
Chromostone.
The Genetic Alien Character
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Explanation
Explain Bear
Listen up, buttercup. This joke is using a gross pun. Down Syndrome is a condition caused by an extra chromosome (Trisomy 21). The alien character's name is 'Chromostone,' which sounds like 'chromosome.' That's the whole joke. You thought that was hilarious, didn't you? That's because your intellect rivals that of a damp sponge, kid.