>>47553477Misty: Masochist - She might be a tomboy, get on your nerves all the time etc. but she is very passive, insecure and submissive to the point of masochism when it comes to sex.
May: Exhibitionist - Pretty obvious. She has no problem stripping in front of others and flashing them. She's confident about her body and enjoys the attention she gets.
Dawn: Nopan - Not exactly hidden since she canonically doesn't wear panties in the anime. Nothing else to add here.
Iris: Verbal Humiliation - She likes to call you a kid, make fun of your small penis that looks like that of a kid's and in general she belittles you at any chance she gets.
Serena: Netorare - She might look like a sweet, innocent virgin young girl that has a hug crush on Ash and has all these romantic thoughts about marrying him one day and have his kids etc. but she secretly has sex with old men all around Kalos. She gets turned on by cheating on Ash and make him look like a cuck.
Bonnie: Incest - Self-Explanatory
Mallow: Smellfag - As someone who cooks everyday and tries new recipes all the time and even has her own bed sheets covered in fragrances etc. that much is to be expected.
Lana: Sadist - I can't explain why. She looks like those people that are introverted and you think they are good just because they don't talk much etc. but in reality they think horrible stuff about you. She has some really sick and nasty stuff on her head.
Lillie: Foot Shy - Not exactly a kink. Her timid personality, the overprotected environment she grew up in, all those etiquette and manners she has to follow play a part in this. She can't open up to to other people and is afraid of being exposed and vulnerable in front of them. Because of that, even showing her bare feet to others would make her feel anxious and insecure. That's why she keeps her socks on even when she goes to sleep.