Sendai's real-world counterpart was an IJN destroyer known for nighttime operations—her crews trained specifically to spot enemies in the dark and strike first. She saw combat in four major battles, three of which happened at night, which basically made her a specialist in that area.
In KanColle, this historical detail got turned into her whole personality. Sendai is obsessed with night battles to an almost comedic degree. Fans often note she's adorably unhinged about it, treating darkness and combat like they're the best things in existence. It's one of her defining quirks that makes her stand out.
Content compiled by AnimeList.moe from publicly available sources.
