Sōichi Mogami

Sōichi Mogami was a member of Old Border and Yūichi Jin's mentor who sacrificed himself to make the Black Trigger Fūjin.

Appearance
Mogami wears a pair of sunglasses atop his head and has slicked-back fair hair.

Personality
He was a very close friend of Yūgo. He also disliked conflict, and wished for co-operation in Border.

History
Mogami was a former Border Agent, and one of Border's founders. He also was Yūgo's rival. He used to be Jin's mentor. He used his life to make a Black Trigger, the same trigger which Jin formerly used.

Plot
At a certain point in time before the start of the series, he joined Old Border. He later participated in the mission around five years ago which killed him and nine of his friends.

Black Trigger Capture Arc
Yūma mentions him as the acquaintance his father had in Border. Yuri reveals that he died 5 years prior to the current events after creating the Fūjin.

B-Rank Wars Arc
When asked by Osamu about the current whereabouts of the members of Old Border, Yuri points doesn't point out Mogami as he was one of the ten who died.

Abilities
Having taught Jin, one of Border's most powerful agents, how to fight with Triggers, and having been Yūgo's rival when the latter was as strong as Shinoda currently is, Mogami was undoubtedly an extremely skilled fighter. His ability to create a Black Trigger implies that he possessed a large amount of trion.

Trivia

 * In a photograph of Old Border, Mogami is depicted standing next to Shinoda and Jin. His sunglasses and slicked-back hair are also similar to what Jin will wear later on.