Ryusei Koki (real name: Ryusei Abikoki) is one of the male students who attended Akademi in 1980s Mode.

Before he was reintroduced in 1980s Mode, he was one of the male students who attended Akademi in 202X Mode.
Ryusei wears the default 1980s student uniform.

He has spiky blue hair that's swept up and back to the right, with two strands that stick out, one reaching his right eye and one reaching his ear. He has blue eyes and blue glasses as well.