Beak
Moving on, we have Beak, a mutant with a bird-like appearance and limited flight abilities. While Beak had his moments, he was never a particularly interesting character. His appearance was strange, and his abilities were not particularly impressive.

Beak, also known as Barnell Bohusk, had a unique appearance that really set him apart from the rest of the X-Men. His bird-like features and ability to barely fly made him a cautionary tale of bad mutations.