Why do people find weird tg characters having fantasy hair colors? Yes maybe the manga has some realistic tones but still tg has a manga/anime style. Not all the mangas and animes have characters with fantasy colors but mostly do because more colors give more personality and make the characters different from each other. Tg uses that, and its fiction anyway, you can play with whathever you want on fiction.
I couldnt imagine Saiko with like black hair or something her blue hair is iconic