Hikari Kōhei is the human name associated with Ultraman Hikari in Ultraman Mebius. He is a brilliant scientist and a former researcher from the Land of Light, known for his intellect, calm demeanor, and advanced technological skill. In the series, he serves as a key ally to Mebius and the GUYS team, often providing crucial support, analysis, and weapon development. His role emphasizes strategy, science, and redemption, as he helps defend Earth against powerful monsters and alien threats.