He had a scar across his nose. He had a mustache and a small goatee. He wore armor befitting his rank.
He had an easy going personality, didn't really think danger was right around the corner. He seemed well liked by his men.
It is assumed that he worked his way up the ranks to become a general in Mou Gou's army.
During the night after the conquest of Kinrinkan, Rin Ko successfully kills a number of 1000-man commanders, which leads to 300-man commander Mou Ten inquiring and subsequently voicing his concerns about the still occurring events. Ra Gen shows his appreciation for Mou Ten's concerns and notes that the Mou Family grows secure with each generation. Nonetheless he believes that Mou Ten is over thinking things.
A few days later while Mou Gou's army was traveling to their next target, Ra Gen is slain by Rin Ko.