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Template:Infobox CharacterSatoru , known in America as his full name Kei , is the male star of Ape Escape 3. He is a "typical overconfident hothead", and he wants to stop Specter because it sounds like fun.
He is also Yumi's brother. They are supposedly twins, given that they are both in the fourth grade. Their aunt, Aki, fills a role similar to Natalie in the original Ape Escape, in that she provides the siblings with new Gadgets and Morphs. In Saru Saru Big Mission he appeared as one of the hostages of Yellow Monkey (whom he was trying to avoid "marriage" with Yellow, which was actually a doll) and Pink Monkey that Spike and Natalie have to rescue. He is voiced by Hope Levy in the American version.