I'm currently on the last episode of The Second Raid and am hesitating to finish it purely because of Chidori. At the start, I disliked her because she was annoying. When Tessa showed up, she became one of my favorite characters because she's intelligent and strong-willed; not just an annoying individual like Chidori is. I understand that Chidori has her moments throughout the show that display her usefulness, and I enjoy such moments.
But nonetheless, she is still annoying. Unfortunately. The episodes where she was absent were incredible, and the episodes with Tessa starring as a protagonist were also incredible. I tolerated Chidori for all of this time, but it started to become a problem when she started to rub off of Sousuke. Sousuke is also a character I like, but I didn't like how he completely changed when he was stripped away from the mission.
Again, I understand that this is character development, but I personally dislike it. Suddenly he won't work to protect his friends that he's known for over a year, and practically disobeys Lieutenant Commander Kalinin who he's known since childhood? That is where the "character development" becomes poor writing.
I believe I got spoiled and found out that Sousuke and Chidori got married, which I'm not surprised to know. I always end up liking the second girl more than the first, unfortunately. All in all, Chidori is extremely annoying and should've been killed off completely.