One of the biggest examples being Kurenai. When we first meet her, she's a newly introduced Jonin taking on a team for the first time, and was heralded as one of, if not the strongest Genjtsu users in Konoha at that time, yet she's rarely been shown involved in any battles and one of the few times she was, which was against Itachi, one of her strongest Genjutsu was effortlessly jobbed. By the time we see her again, she's pregnant with Asuma's child and is made to pretty much do nothing for the entire rest of the series and also pretty much a total stay-at-home mother now, and we even see her father with that sexist view of his when she was a kid.
Eyup, which is tragic, since she could have been a mom and still remained a kunoichi.














