Ohina Taikai, formally Hinako Taikai, is the younger sister of protagonist Hiroshi Taikai, sharing his reddish-brown hair and living in the same household. Her cherished golden retriever puppy, Chibi, becomes drawn into the conflict when King Ivalda's forces target dogs worldwide; Gold Lightan's intervention ultimately saves Chibi unharmed. Ohina joins Hiro and his friends as part of the informal "Bratty Rangers" (One Pack Rangers), supporting Gold Lightan's mission. Though not a frontline fighter, specific episodes highlight her experiences: "Ohina narrow squeak" centers on a perilous situation involving her, while "Ohina circus star" depicts her participation in circus activities. Her foundational relationship with Hiro positions her within the human network aiding the sentient robots.