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Ekubo: bishop
I thought about a knight because of his outfit but he has the strength of a bishop in a chess games. Ekubo doesn't seem strong but if he's still there at the end of the game, he becomes a danger to the king.
Serizawa: rook
He's built like one (lol)
Joke aside, Serizawa is canonically a rook, I don't know how to explain but he won't fool around like a bishop and won't be as intimidating as a knight. Serizawa does the job told and doesn't need a strategy to do it, just an order.