Kermit - My Newfound Friend.

Kermit The Frog is Green.
He was born on Leap Year Day (so they say).
His Voice and puppetry on Sesame Street at Least, was done by Jim Henson but is now done by Steve Whitmire.
His best friend is Grover Monster.
He is almost the only one with a built in smile.
He is also on Sesame Street, as a reporter.
On the Muppets he got married to Miss Piggy, and he has a nephew called Robin.