Chiro is the main protagonist of Super Robot Monkey Team Hyper Force Go!. Over the course of the series, he grows as a person and as a fighter, though uniquely compared to a majority of his contemporaries, Chiro actually starts the series already fairly adept at fighting.
Chiro is a young adolescent male with a slightly pale Caucasian complexion, black hair, and slightly dark blue-green eyes. He is roughly double the height of the monkeys, and less than half the height of the Skeleton King.
His civilian attire consists of a long-sleeve shirt over top of a formal white button-up with a tie that matches his eyes, and a pair of blue jeans (that also match his eyes) with black and white sneakers. When wearing this and most other outfits, Chiro's eyes appear more almond-shaped, his face appears more angular, and his hair is styled neatly, with a combed fringe on the front.
When preparing for battle, Chiro suits up into his combat uniform. The uniform consists of a white two-piece suit resembling that of a pilot's clothes, complete with large black buttons, an orange scarf, matching orange gloves and a pair of dark, blue-grey boots. When wearing this outfit or variants of it, Chiro dons a white mask with more unkempt hair, and his face takes on a slightly rounder appearance, with a smoother chin and more circular eyes. Interestingly, the edge of the mask between Chiro's eyes is almost never visible, always being obscured by his bangs, barring some notable exceptions.
Following Antauri's sacrifice in I, Chiro, his soul merges with Chiro causing Chiro to transform into a bestial weremonkey. While in this form, Chiro grows a tail, and black fur, his skin turns grey and he grows a pronounced muzzle filled with sharp teeth, his ears grow larger, and his eyes become similar to those of the Robot Monkeys, albeit with Chiro's eye colour. His hair also becomes more unkempt and he loses his ability to speak, instead only making monkey screeches and other noises.
While attempting to activate the Silver Monkey, Antauri's soul is transferred into the machine body, causing Chiro to partially return to normal. He retains his unkempt and beastly traits, but looks considerably more human. In addition, he regains his rationality and ability to speak, albeit only in simple phrases.
- Chiro (alongside Jinmay) would mark the second of three instances where Greg Cipes voiced a character who was romantically involved with another character voiced by Ashley Johnson. The other two instances being Beast Boy and Terra from 2003's Teen Titans, and Kevin Levin and Gwen Tennyson from 2008's Ben 10: Alien Force.