The Good Drakes (Ocean Black #2) by EJ Wedge:
 
Book 2 in the Ocean Black series... Space opera character drama; running the ladder of subplots and features of sci-fi and fantasy, from post-apocalyptic samurai, bear cavalry, and space pirates, and an interstellar political power struggle.

Myn is a space pirate captain, sailing Ocean Black, with no experience on his own, testing his own custom-built ship for the first time. From this humble beginning, he rapidly wins a series of battles so insane, he becomes the most infamous space pirate in a century. Myn is influenced, even years later, by his time at DuVanqueth Manor, and especially the mentorship of Rose DuVanqueth. However, his actions will undo the interstellar peace her life represented, bringing the threat of war to every member of the DuVanqueth family.