Maji was once an officer in the Earth Federation fleet, and served as chief engineer on the Braves under Captain Yamanaka. He unwittingly married a Mazone spy who bore him a daughter (Mazone reproduce asexually) named Midori. After the death of his wife at the hands of Captain Yamanaka, his daughter was kidnapped by other Mazone, and Maji boarded the Arcadia after learning Harlock was investigating the same aliens he suspected were responsible for Midori's disappearance. He eventually finds her, but the reunion, alas, is not a happy one.

Maji has a fondness for young Mayu Oyama, as she reminds him of his lost daughter. He's small in stature-like almost all of the Arcadia's crew-but that doesn't stop him from facing down Harlock when he believes Midori is in danger. After the war with the Mazone is won, Maji oversees the construction of a home for children orphaned in the conflict.

(Source: cornponeflicks.org/harlock/pirates.html )