Eileen

Description
Eileen is a shy, intelligent, and timid mole (explaining her brown tail). She works at the same place as Margaret, better known as her co-worker and one of her really good friends, likely her best friend. She first appeared in Brain Eraser and is voiced by Minty Lewis. She also appears in the episode Do Me A Solid with a more primary appearance and a redesign. She has a big crush on Rigby, but he doesn't seem care for her about it. She even tried to make Rigby jealous, in Crusin', by having a "boyfriend."

Despite her good nature and having a crush on Rigby, she laughed at him when he purposely poured scalding coffee on himself, and she called herself an idiot in Do Me a Solid. She is also seen in A Bunch of Baby Ducks and Skunked. She made her season three debut in Camping Can Be Cool. But she was in an earlier episode in season 3 (Terror Tales of the Park) but she was only in a picture. It is also shown in A Bunch of Baby Ducks she is highly allergic to duck dander.  

Appearance
As said above, Eileen is a short mole with tan fur. She has red glasses and wears the same uniform as Margaret, although in Do Me A Solid she wears a pink shirt with ruffles and a blue skirt. She has a small light brown tail and brown hair tied into a side ponytail. In Brain Eraser, her ponytail was on the right side, in Do Me A Solid, her ponytail was moved to the left side, and her glasses are red. In Brain Eraser, she didn't have white in her glasses, as seen down below, but in Do Me A Solid, she did.

Rigby was camping out with Eileen in an episode called Camping Can Be Cool.

Margaret
Eileen is Margaret's best friend at the Coffee Shop, where both of them work. The two get along well, and are always seen together (whenever Eileen is present). Both share friendship with Mordecai and Rigby, sometimes talking about them.

Rigby
Rigby is Eileen's crush ever since Do Me A Solid. Rigby, however, does not think the same way, therefore the love is only one sided. Up until Skunked, Rigby has regarded Eileen as an pest (and probably still does); only after the episode do the two start to become friends.

Appearances

 * Brain Eraser (first appearance)
 * Do Me A Solid
 * A Bunch of Baby Ducks
 * Skunked
 * Terror Tales of the Park (as a picture)
 * Camping Can Be Cool
 * Slam Dunk (mentioned only)
 * Cruisin

Trivia

 * Among the animal characters, Eileen's hair and face resemble the most like a human's
 * Eileen appeared in the Halloween short In The House, but as a picture.
 * In Camping Can be Cool it is reaveled that she's good at camping things because of a phase she was going through, where she got lost in the woods a lot.
 * Eileen's seemed to only have a pupils for eyes in Brain Eraser, but in later episodes she started having regular eyes. This could be because the artists had planned for Eileen to be a background character.