Chiaki stole the show for me. I've always preferred HanaKana in a stoic role, and that one piece serafuku complete with zettai ryouiki, on top of eyeglasses and long black hair? Hit almost every moe element I have. Makes her character definitely to be the most mysterious of the lot, especially since she has the same last name as another pirate in ED. Which begs the question, if Chiaki is the daughter of a rival pirate, why save her at all?
Only question is, will the show provide even a smattering of shippy material to keep me interested? Scanning the OP/ED shows no candidates unfortunately.