They're all from the game Yu-gi-oh Saikyo Card Battle

Psychic Tendo - the green haired boy

Strong Jukyu - the brown haired boy

(Light) Tsukiko (not me) - the green haired girl

Dark Kuroda - the silver with purple bangs haired boy

Btw. Shoma didn't dueled Tsukiko (not me), yet...

Will there be more characters?!

Maybe the protagonist?!