Ibushi Arima is a 3rd year at Binan High School. He is the Student Council Vice President, and seems to understand the troubles of Kinshiro the most, standing by his side as if he were a butler.
His given color is Silver, and he transforms into "The Silver Chevalier, Argent"(Kazekaoru Hakugin no Shuvarie, Ājento).
(Source: Binan Koukou Chikyuu Bouei-bu Love! Wiki)