Leon is a graduate of the Military Primate Training Academy, which places highly skilled monkeys into exceptionally crappy jobs for zero pay, so humans don’t have to do them. If ever a heavily defended beach needs to be stormed, you can bet a platoon of monkeys will be the first ones getting riddled with laser holes.
Leon was placed with Titan Force Five as a monkey butler, complete with tuxedo, and despite his condescending attitude proved invaluable at keeping the ever-more-dysfunctional team running as smoothly as possible. Leon cannot—or perhaps will not—speak English, and communicates almost entirely with contemptuous stares and occasional eye-rolls.
Leon inherits the role of fifth team member when there simply aren’t enough warm bodies to pilot the five robots. Leon, ever-competent, simply shrugs, puts on a helmet, and hops into the nearest cockpit. Leon just does what needs to be done. That’s what the Primate Corps are all about.