Board Thread:Gumball Talk/@comment-4972339-20130911113025/@comment-5691231-20130911115556

They never actually did in the show. Although if you're talking about fanfiction (which you probably are) then it's not really a mystery. People ship almost anyone (or anything) nowadays. Maybe it was because of the ending to The Flower? Nah, I've seen Gumball and Carrie artwork long before that. It could possibly be because of The Ghost, even though they were like enemies throughout the entire episode.

I've seen some fanart of Mr. Small and Nicole, and also Gumball and Rachel, and these characters never interacted much with each other in the show (or at least not enough to ship them), but still have some good fanart. So just about anyone in the show can be shipped with anyone else.

The fanart of them actually started appearing shortly after The Ghost, though. So I'm just going to say it was because of the episode, or people just thought they'd make a good couple. Or they may be something else I'm probably missing.