Oscar the Grouch is a furry, green Grouch who lives in a trash can on Sesame Street. In fact, he loves trash so much that he's rarely seen outside of his trash can. His trademark song, explaining his passion for refuse, is "I Love Trash". Like all Grouches, Oscar's mission in life is to be as miserable and grouchy as possible, and pass that feeling on to everyone else. When a visitor knocks on his trash can -- invariably interrupting him from a nap or an important task -- Oscar greets them with a snarl. He complains that he wants to be left alone, although when he's left entirely to himself, he's dissatisfied -- there isn't anybody around to irritate or complain to.
While Oscar has had many pets, his closest companion is his worm, Slimey. He also has a girlfriend, a Grouch named Grundgetta, although a romantic relationship between two Grouches is understandably rocky. Grundgetta usually calls him Oskie while he occasionally calls her Grungie. Telly Monster and Elmo both consider Oscar to be a close friend, although Oscar disputes this since Telly and Elmo are the two monsters that Oscar doesn't like at all. However, Oscar reluctantly confirmed in Grouchland that the latter was indeed his friend.
Father: Mr Grouch
Mother: Mrs Grouch
Brother: Ernest the Grouch
Sister: Bunny the Grouch
Grandfather: Grandpa Grouch
Grandmother: Granny Grouch
Uncle: Uncle Hank
Love interest/girlfriend: Grundgetta
Friends: Elmo (sometimes), Zoe (sometimes), Cookie Monster (sometimes), Grover (sometimes) Telly Monster (sometimes), Ernie and Bert (sometimes), Barney (sometimes), Big Bird (sometimes), Mr Snuffleupagus (sometimes), Herry Monster (sometimes), Grundgetta and other Grouches
Enemies: Elmo (sometimes), Zoe (sometimes), Cookie Monster (sometimes), Grover (sometimes) Telly Monster (sometimes), Ernie and Bert (sometimes), Barney (sometimes), Big Bird (sometimes), Mr Snuffleupagus (sometimes) and Herry Monster (sometimes)
Likes: Trash, arguing, arguing with other Grouches, telling anyone to get lost, going out with Grundgetta and insulting goody-goody characters like Elmo and Grover
Dislikes: Being disturbed, Yo Gabba Gabba and some shows he hated like Barney and Friends and Yo Gabba Gabba