Seijūrō Akashi (赤司 征十郎 Akashi Seijūrō) is the captain of Generation of Miracles. He is the only person that the Generation of Miracles knuckles under. He is now the point guard and captain of Rakuzan High and is competing in the Winter Cup. Akashi now serves as the main antagonist in the story. 

Akashi is rather small-sized for being the captain of the Generation of Miracles, as noted by Furihata, being only 173 cm tall, making him the shortest out of the Generation of Miracles. He has spiky red hair, large eyes with vertical pupils and an oval face. His hair was worn with longer bangs in Junior High school and during the events before the Winter Cup. However he cut them at the beginning of the Winter Cup with Shintarō Midorima's scissors. Color pages have shown that Akashi has heterochromatic eyes, with his right eye being red and his left being yellow/orange. It was shown in a recent chapter that back in Junior High school, Akashi's eyes were both red. They changed in Junior High school when the initial conflict between the Generation of Miracles occurs. It can be noted that after his eyes have changed, his personality also becomes much colder. He wears the white and light blue Rakuzan jersey with the number 4.
Akashi's appearance was not revealed for a long time. The times he appeared or was mentioned, only the lower part of his face was seen, or the back of his head. His full appearance was only revealed at the Winter Cup.

For more information; http://kurokonobasuke.wikia.com/wiki/Seij%C5%ABr%C5%8D_Akashi

According to the CHARACTERS BIBLE:

    Akashi's alternative job choice is to be a professional shogi player.
    His hobbies are Shogi, Go(Wei-qi), and International Chess.
    His specialty is horse riding.
    His favourite food is tofu soup.
    His motto is "Quick and decisive".
    He hates disobedient dogs because they don't listen to him.
    His type of girl is who has dignity.