Casi is a computer program that takes the form of a human girl. She appears to help out whenever she can or assists the professor. She also appears as a real girl.
Little is known about Casi, except that she is a loyal assistant to the Professor and is also not quite as pushy as Natalie. She is a nice, but quiet girl.
Casi is a pale-fair skinned girl originally with big violet eyes that became green over time, and long flowing green hair usually worn straight down or in a ponytail.
Originally Casi wore a black spandex outfit with white cuffs below her shoulder and around her neck. She also wore white socks with red, white, and black shoes, two red bracelets, and a pair of red and white circled ear pieces.
Eventually she began to dress with more fashionable, revealing outfits that showed off some joints of her body, like at her knees or wrists.
A helpful girl who appears to be formal with others.
Working at the Professor's lab, she helps Spike travel through time by giving him instructions on how many apes he has to catch. She also displays the level titles and how many monkeys are in these stages.
Ape Escape: Pumped & Primed Edit
Casi appears to join the Hi-Tech Tournament along with Spike, Natalie, and the Professor. This in turn, makes her a playable character. After the final battle they had with the Grid Core, Casi helps everyone escape from the world the Grid Core trapped them in. They all arrived back in the normal virtual world safe and sound.
- Although not being present in Ape Escape 2, Jimmy can unlock 4 bonus sketches of her.
- The name "Charu" originates from the word 'bacharu', a wasei-eigo of 'virtual'.