Ruby Bird

Ruby Bird is a girl from Greg's  school who is in The Third wheel. She is the only girl to have ever been suspended, for biting Mr. Underwood's arm so hard her front tooth is lodged in it. Fregley has a huge crush on her, but she really hates him.

Appearance
Ruby is a very unattractive skinny person, with only one front tooth due to her habit of biting people.

Trivia
She and Fregley are the only characters whose both ears are alway shown.