Keita Kakuma, aspiring to follow in his father Oushou Kakuma's footsteps as a sports commentator, possesses very short blue-gray hair and red-framed glasses, typically dressed in his Raimon school uniform. His appearance evolves in later entries like Inazuma Eleven GO, featuring somewhat longer hair, thicker-framed glasses, a blue suit, a red-and-white striped necktie, and headphones as part of a television crew.

Initially a Raimon Chess Club member, he transitions into commentary. During the U-15 Spring Cup, he partners with Tabe to cover the Raimon vs. Hokuyou Gakuen match, analyzing Hokuyou's rise from Kyushu and their rebuild under captain Soramiya. His commentary extends to major tournaments, including the Holy Road nationals in Inazuma Eleven GO and the Football Frontier International in Inazuma Eleven Orion no Kokuin.

He also joins the Raimon soccer team as a player. Recruited from the chess club after speaking with Haruna in the original Inazuma Eleven game, his level 99 gameplay stats vary by region: the Japanese/American version lists 285 GP and 300 TP, while the European version shows lower values. His special moves progress from Gorimuchuu, Monkey Turn, Dokonjou Bat, and Bunshin Feint in earlier games to techniques like Super Scan, Megane Crash, and Echo Ball in Inazuma Eleven 3.

He is the older brother of Kakuma Ayumu, as confirmed by Level-5 president Akihiro Hino. His dub name, Chester Horse Jr., originates from "horse chestnut." His father, Oushou Kakuma, frequently commentates major matches like the Football Frontier and Holy Road, establishing a family broadcasting legacy. In the movie *Inazuma Eleven: Saikyō Gundan Ogre Shūrai*, he commentates the U-15 Spring Cup match, continuing this role.