Sendai.
I used to know her mostly from Sakazaki Freddie's Historical Kancolle Comic. After I dropped, I fielded her because I needed that firepower to push through a map, then 1-5. Then I picked her as secretary ship. And I loved every seconds of it.
Close seconds would be Akagi, as in that close friend I like and respect in despite of her obvious flaws (gluttony), Ise (BRO-tier), Ryuujou and Zuihou (Imouto-tier), Haruna, Yukikaze and Yuudachi (wanna pet the both of them).