I often like these LI's too but Kira isnt working for me. She feels like a anime tsundere without the cuteness to me. And shes like super super clingy even when not on her path.
I disliked the MC's lovey dovey behavior towards her too, she would probably have annoyed me less if the mc would have been more "casual" with her. It annoyed me how often she ended up naked on top of the MC when not on her route, looked so fucking desperate.
She isnt funny or particulary smart and isnt even that fiery (only to the mc in the beginning). And i know they are apparently powerful allies but this fact is laughable in itself already. Its two sisters and a crew of 2 (?) and okay i guess the rest of the pirates who they will best with their "crew".
If i had to describe why i dont really like her (i dont hate her tho) as short as possible: Too much, too fast