I think this is where I msg you;
I was thinking the reason y/n was so into fashion, drawing and creating things was because he never had the best interaction skills and hated talking so much, his voice is natural low/soft so he is barely heard, he got bullied a lot in his childhood for his soft voice and appearance, I'd like to think he'd have that condition where his skin is two colours and he got bullied for it, one eye would be albino; just the eyelashes and eye can be a lighter shade because of the other skin colour while the other eye is all normal. He'd be so into fashion because it's how he can express himself. He loves to design clothing for his brothers and mother. It saves them money to buy new clothing but also takes money for the fabric, but I feel like y/n would get fabric from op shops and turn them into clothing, then for the harem I feel like he has a hard time with emotions and feeling because he's never felt romantic love to somebody before, I'd say it'll take him time or in your other book where he had the fatest crush on Koko, something like love at first sight for y/n in a way, I'd think y/n would compliment people a lot in his mind but will speak out all his thoughts except those ones, I'd like for him to have a harem so that he can a lot of love even though he us dense as hell to see who likes him, the harem can treat him like a king! I'm not sure if that's everything you want, but it's all I could think of at this moment!