In the Anime/manga Crossovers, is There Any Risk in Dating a Pink-haired Girl?

It's common knowledge that pink-haired beauties are generally gentle, kind, considerate, and virtuous—ideal girlfriends and wives. Watanabe Yuuki, transported to another world, is surrounded by such beauties: his childhood friend is pink-haired, his neighbor is pink-haired, his school seatmate is pink-haired, the girl in the next class who likes him is pink-haired, his teacher is pink-haired, the stalker girl who's been following him is pink-haired, the beautiful girl he meets is pink-haired, and even the alien is pink-haired. Pink-haired is fine; they're all cute, and he likes pink-haired girls, so finding a girlfriend and living a happy life shouldn't be difficult. But his childhood friend went to study in England, his neighbor is a socially awkward seamstress who stays home all day, and his seatmate is also socially awkward and plays in a band. For some reason, the stalker girl who's been following him is out of the question. He can't betray his ancestors, can he? The beautiful girl he meets seems to have some mental issues. The alien is another story—what about being raped? All the pink-haired girls around him seem a bit off. Why is finding a girlfriend so difficult? So, Watanabe Yuuki turned his attention to Goto Jiri, the most normal-looking among the group of pink-haired girls. Goto Jiri: Yuuki-onii-chan, I'm only seven years old this year.