Fumiya Hoshikawa

Fumiya Hoshikawa is the fourth-born sibling, the youngest son, and Remi's twin brother. A Japanese teacher skilled in karate, he possesses a wide knowledge of languages, including various alien dialects.

Despite his intelligence, Fumiya can be impulsive and occasionally childish. Because he and Remi were only one year old during the attack on Sidon, they suffer from the trauma of not remembering their parents' faces.

As Five Black, Fumiya fights with the Power Cutter, Black Jaws, and Cutter Disks, combining his linguistic skills, martial arts training, and raw determination to protect the galaxy.