J

J is the tenth letter, she competes on the Pooping Poopers

Climbing Up the Top
J is friends with I

she competes on the pooping poopers and her team wins

The Cold Wave
J's team loses

Terrible Math Questions
J talks to I about his value, saying he's a "complex number", scaring Catmint, later, she comes and got no votes, thus she gets cake, and her team wins again.

A Christmas Special
J's team loses after failing to open up presents first.

Trivia

 * she in most languages makes the sound /j/ (equivalent to English y)