Oscar is a Grouch who lives on Sesame Street. He's green but was orange for the first season*. (He was switched because green was more grouch like.) He has many pets, most prominently his worm named Slimey (How the heck did you forget that?). He also has several elephants--one named Fluffy, one named Penelope, the rest unknown--a pig, and a dog. He also has a car known as The Sloppy Jalopy, which took Maria to the hospital when Gabby was born.

He does have at least three elephants.

* Orange:
And green:
(Yes that groovy dude next to him is Gordon, played by Matt Robinson at the time)
(More at http://members.tripod.com/~hooperfan/index-2.html)