Kouta Hoshikawa (星川 コウタ Hosikawa Kōta) is one of the protagonists of the Brave Fighter Exkizer television series.
Kouta is a student at the Asahi-Dai Elementary School in the 3rd Grade Class B. He first met Exkizer in the garage in his house when Exkizer ended up in his father's sports car, and eventually became the Kaiser's link to the human world.
Exkaiser is secretly his dad's sports car.
Mario is his pet dog.