Cater is one of a few characters who will integrate English-language words into his dialogue, such as “Let’s go,” “stop,” “How to,” “bye-bye” and “OK.”
Cater will also say “sorena” (which is also what he says when you select him for a battle), and can mean “exactly” / “I know right?” / etc. depending on context.
He will also say “yah-ho,” as a kind of playful, casual greeting, and “yoro yoro,” a playful, casual, shortened version of the word “yoroshiku,” which doesn’t really have an English-language equivalent but Twst EN localizes as “TIA” (thanks in advance) in Book 7.
Established in the game as one of Cater’s character traits, he is often calling things cute.
Cater will also say “tohoho” as an onomatopoeic expression for feeling resigned/disappointed, with a little bit of light-hearted/comical self pity.
Twisted Wonderland Reference Note 