because they should seem similar in some way?
If a common hair color like blonde, brown, black might be not so weird
But just like I mentioned in post, HS tutor, completed different hair color, just like randomly pick someone and say:
"Hey, this person will be your siblings from now on"
that would be a bit weird imo
but if the plot mentioned before like Photo Hunt,
it say sis got dyed before, and have a photo is sis's original hair color picture, then I won't bother for this
I don't mind when related characters have differing hair colors. The idea is just to create unique characters and hair dye exists.
I found out that most ''got different hair color game'' might use Koikatsu in base
And it recall a memory of me that 斉木 æ¥ é›„(Saiki Kusuo) used to say when he born,
he got a pink hair, that's uncommon, because his parent are brown hair
So he use superpower to make whole people got different hair color be a common sense
Which make anime always make character got different colors hair has a interpretation
i find it weirder when mc has one color and the whole family another was he adopted
trueeeee
but if it is a adopted-incest, then I won't have a word
Genetically speaking, the girls from radiant are all "fine" so to speak. like, that mix can happen. its super uncommon as you'd assume, but its not an impossibility. and as for any "non-typical" hair colors (i.e not naturally occuring) its both a porn fantasy, and dyes still exist. so it typically doesn't even register in my head when I'm playing porn games. it's by far the least weird thing many of them have. So it doesn't personally bother me at all.
yea, that's why I mentioned in post, I mostly could ignore this weird situation
but still got a feeling, if they have same color, it would be more immersive