Grumman

Lieutenant General Grumman is Colonel Roy Mustang's commanding officer and mentor at East City headquarters. He plays chess with Roy Mustang when the transfer to central has came for Roy, Roy then bests the Lieutenant General in a game of chess to which the General gives him the board (And pieces) as a farewell gift. He is an old man that takes a lighthearted approach to his command. When Roy Mustang transfers from Eastern Headquarters to Central, Grumman authorizes the transfer of Mustang's subordinates, including his granddaughter Riza Hawkeye (though it is unknown if she is aware of this relationship). He makes no further contributions in the anime, though during a brief cameo in Conqueror of Shamballa he is implied to have replaced King Bradley. In the manga, after the homunculi strip Mustang of his subordinates, he calls for Grumman's aid. Grumman, not under the homunculi's surveillance, has since been acting on Mustang's behalf in intelligence gathering and communication. Though a willing ally, he is reluctant to openly work against the military as becoming a traitor would make it difficult to become the leader of Amestris. It is implied in a joke that Grunman doesn't do anything in the East City Headquaters when he says to Roy: "Now that your transfer to central has become final, I may have to start doing things around here again.", although this may just be an inside joke between the two.