Tadashi Monono is a young orphan who has lost his entire family to the Illumidas invasion. With virtually no money for food, Tadashi decides to kill Harlock for the sizable bounty placed on his head (in the Endless Road SSX series.) Harlock wins the duel, but spares Tadashi's life, and invites the homeless boy aboard the Arcadia, where his low opinion of Tochiro's cooking earns him the position of ship's cook. He eventually learns to pilot a Spacewolf, and becomes a big brother to the young castaway Revi Bentselle, whether he likes it or not.

While nowhere near as bloodthirsty as his counterpart Tadashi Daiba in the Space Pirate series, Tadashi is still eager for some payback against the Illumidas, and has very definite notions of what a "real man" should be expected to put up with. His admiration of Harlock and Tochiro's courage causes him to act rashly at times, but he also comes through in a clinch on several occasions, and proves himself as a valuable member of the crew and someone to whom Harlock can pass the torch when the time comes for him to depart.

Tadashi Monono appears only in the SSX series, and is in no way related to either Tadashi Daiba or Galaxy Express 999's Tetsuro Hoshino, with whom he is often confused.

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