ディーン＝カヴィル

"...Experience outdoes plain talent, it would be good if you remembered that."

Vice-captain of the seventh team of special anti-pirate forces in the Guardia Navy.
He owes Frederick a favor and in order to repay him he becomes his subordinate in the special team.
He has the best sword arm among the whole of the Guardia navy and is a person who is feared by the pirates.
A quiet guy who doesn't like to talk about things outside of work and who likes to think in the long term.