N

N is a character who first appears in the Alphabet Attack episode "Climbing Up the Top".

Climbing Up the Top
N makes her appearance when she was mentioned by O when she makes cute faces, even though she doesn't have a face, however, she and W appreciated it, and N later competes in a game which pushes off an iceberg, killing her along with everybody else except for P and Q who make it alive, and they sort the teams, N joins P's team as she becomes a member of the Pooping Poopers, N later wins as she climbs on top of a mountain.

The Cold Wave
N loses as she fails to make a proper snowman, thus her team is UFE.

Terrible Math Questions
She gets 1 vote, but does not get eliminated, she watches H get eliminated as she sees H getting launched off into space due to an erupting cyrovolcano H was sitting on, N later wins as she gets an answer right, thus, the Pooping Poopers win.

A Christmas Special
N's team loses after opening up presents too late.

Description
N is a cute little 14 year old girl who likes M and tells him to always calm down, however, N is also BFFs with O, since the two are born at the same millisecond, they are quite the same age as each other and like to talk to each other.

Trivia

 * N is the only character who's NATO phonetic name is named after a month, that month being November, the 11th month of the year.