Voiced by: Hōchū Ōtsuka (Japanese), John Swasey (English)
An Amalgam agent and the head of Amalgam's Execution Squads , Gates seems to have two personalities. He is known to kill his subordinates whenever he messes up an operation, hears that an Amalgam-sponsored mission is a failure or doesn't display any regard for life, and (for the most part) when he is angry. Gates kills some in varying ways, pushing one off a chopper, dragging another down on the swimming pool, shooting an Amalgam terrorist in the head and even played around with Xia Yu Lan's corpse. But on the other hand, Gates showed his intelligence that he was able to note the Arbalest and the M9s that were in Balic. At one point, Gates began to sing Ave Maria while Xia Yu Lan and a group of Amalgam commandos began to kill every armed Balic soldier. One light side about Gates is that he is protective about himself, especially about being bald since the front of his head shows no hair present. Gates is killed by Sousuke when he uses the Arbalest's Lamba Driver in full power to defeat his Chodarl Arm Slave.
It can be assumed that Gates was known as "Mr. Kalium" throughout Amalgam, as in the light novel, A Dancing Very Merry Christmas, it is said that Gauron (otherwise known as Mr Iron) was responsible for the death of Mr. Kalium (Gauron does put into motion a series of events that end with Gates's death, though Gauron's only intention seems to have been to lure Sousuke to himself).
It is shown that he is also a sexual deviant. He proves this by saying how even though Xia Yu Lan and Xia Yu Fan were underage he did not hold back to "satisfying" them as well as himself leading him to being a pedophile. He also calls them Lolita-kun (lolita is a unofficial term for a child in pornography) when taunting them for escaping. When he manages to acquire the body one of the girls it makes references to the idea that he will dabble in a spot of necrophilia with either or both of the girls bodies. In the same scene where he finds out that the girls have escaped, it depicts him being interrupted in the process of masturbating over the image of kittens on his wide screen TV. A truly twisted individual, that when concluding his communication with Xia Yu Lan and Xia Yu via his television he returns to his previous channel which is now depicting squirrels. It would seem that on top of pedophilia he has a penchant for bestiality. At least so far with small "cute" mammals.