Yo! Gabba Gabba.

The Genius of Nick Jr.'s Yo Gabba Gabba:

The Players:
DJ Lance Rock - token human
Muno - he's tall and friendly
Foofa - she's pink and happy
Brobee - the little green one
Toodee - she likes to have fun
Plex - the magic robot
Gooble - unhappy bit character

DJ Lance Rock: Being nice is so nice. Being nice is how we show people we love them. We should be nice to everyone.
crying is heard off screen
DJ Lance Rock: It sounds like someone is sad.
Toodee, Plex, Muno, Brobee, & Foofa are playing and having fun, when Gooble comes over crying.
Toodee: Gooble! Go cry somewhere else!
Plex: Toodie, you should be nice to Gooble. He is sad.
Toodee: But he always cries.
Plex: Gooble is sad most of the time, but we should still be nice to him.
Plex sings: Be nice to everyone, and they will be nice to you. Be nice to Gooble and you will have a friend.
As the song continues we learn that we should not only be nice to depressive Gooble, but to bugs and animals as well.

Yo Gabba Gabba is also good because of things like this:
Free Design cover

and for inspiring things like this:
High Five!