Born in 2007 in Vancouver, Canada, to a Scottish-Canadian father and Japanese mother, Koyu is bilingual in both Japanese and English. Koyu's first role was voicing the character of Atari Kobayashi in Wes Anderson's Oscar-nominated stop-motion animation film, "Isle of Dogs". The film opened the 68th Berlin International Film Festival (2018), which Koyu attended with Anderson and all the other amazing voice cast. Koyu's credits also include a part in DC's Legends of Tomorrow, internationally-screened short films as well as commercials for Toyota and Nintendo. When not acting, he plays provincial-level soccer and also enjoys playing guitar and drums.