This guys gets women

Yandere?

I think yandere applies more to pink hair and red eyes

Just in general, bitches with pink hair and eyes tend to be crazy so stay away from them, whether they're a yandere or not.

So your theory is true

This rule also applies to girls with purple hair and purple eyes

Best at killing perhaps

Yes she is best at killing

And at being nuttier than squirrel shit

She scary af, first I thought it would great if someone loved me this much, but after that hotel kidnapping scene, I'm like nah dude forget it