Bastion Misawa

Bastion enters Battle academy during the second series, he says he has been working with Pr Eisenstien, who has given him his old deck.

Story
Bastion becomes the white dorm teacher in the second series and helps Jaden to defeat Nightmare in the 3rd series to get back Alexis.

He accidentaly rips a hole in the fabric of time and space during the 4th series and releases the other dimension into their world.

Deck
Bastion plays a scientific deck: