Didn't watched the show, so I don't know in which episodes Gumball and Darwin could do this.

Aayla Secura and adult Ahsoka Tano (Star Wars: The Clone Wars).

Should have been a quick and easy one, but I ended up changing their poses like five times through the process, until I found the one that satisfy me. Process and psd can be found on Dropbox, so you can see my torments.

Next - a quick and easy one.