Caton is Marcelo's friend and Ester's love interest. He is nice towards Marcelo, but mean towards Ester and Gummy. Ester's interest in Caton is lost because of this. Caton mispronounces Ester's name as "Esme".
On an unrelated note, Caton may also be the character of Saulo, the Salmon Prince. This may be because of his crown, which bears resemblance to a salmon.
Caton is voiced in English by John Leary.