Bully snail
Mary's Ex-Boyfriend is an unnamed snail who just appears in the episode Gary in Love. As his name says, he used to be Mary the Snail's Boyfriend. He is very dangerous because he threatens Gary a lot. He also has his own gang, with also very dangerous snails. At the end of the episode he apologizes to Gary about being mean to him and invites him to dinner.
Mary's Ex-Boyfriend has a purple shell with a blue line going in circles and blue dots. He has an olive colour skin and wears a brown hat. He is also one of the only known snails to speak english.