*A 15-year-old girl who is creative, loves karaoke and fashion, and aspires to be a pop singer, seeing Galaxy High as just one step in her way to stardom. Despite her terrible singing, she is able to win many interstellar competitions, as aliens think her voice is music while Josh and Brett are pained by it. On missions, she is easily distracted when a talent competition or something that could boost her career pops up, with her desire for stardom and fame often placing the group in danger. She has a crush on Seth. She is in the same team as Josh and Brett. Her suit as a space marshal is light purple, and she primarily wields a sonic blaster.

Yoko has tan skin, gold-brown eyes, spiky flame-red hair worn in two bunches along with messy blonde bangs, and she wears lavender-pink lip gloss. Her primary outfit includes a white shirt with a pink trim, a purple and yellow jacket with a yellow "Y" (standing for her name) at the right and an orange belt with matching cuffs, a layered skirt with a magenta top with orange spiked frills and a yellow bottom with a spiked hem, pink and magenta stockings, and a pair of yellow boots.

When on a mission or out on duty, she wears the Galaxy High space uniform with purple as it's main color.

Despite her fame-hunger, Kiko shows genuine and enthusiastic dedication to her work. She is also seems less interested in money or profits, clearly showing more excitement and care about how many people would attend to see her perform.*