Charu

Charu, also known as Casi, is an AI programmed by the Professor to assist him in labwork. While she has a minor role in the main series, she has a prominent role in Pumped and Primed, Million Monkeys, and ''Saru! Get You! On-Air.''

Connection with All-Stars
Charu alerts Spike and the Professor about an otherworldly invasion during Spike's Arcade story. She's also seen in the Time Station level.

Trivia

 * Interestingly, this game calls Charu by her Japanese name, instead of her usual English name, Casi.