the anime was one of my firsts, so i am very fond of the manga/anime. i get that she can be a bit annoying at times, but it is often shown how much she and her brother care for each other. i doubt he would spoil her if he really hates how she is. as the oldest, my siblings can be irritating and used to act almost similarly to her, but i still care about them and likewise. it might be my biased view, but she really isn’t that bad of a character.
if anything ebina is worse
Himouto! Umaru-chan