Rainbow Sherbert is a character introduced in the 2003 episode, The Costume Party. She is the captain of the rainbow float, which voyages the punch bowl pond. She has a pet toucan named Triple Treat. She is voiced by Laura Grimm. 
She has purple hair and eyes. She wears a rainbow sailor helmet and scarf. Her outfit also has a pink top with a symbol of sherbet, underneath it is a rainbow shirt with long sleeves. She also wears blue pants, a purple belt, pink shoes and yellow socks.