back hair is one, seems reasonable. others include but are not limited to:
Snaggle tooth
obsession with small dainty ornaments
obsession with large quantities of stuff animals and/or unicorns
foot fetishes (I don’t care, feet are gross, I don’t want them on my wedding tackle)
mysteriously stinky (we’ve all encountered this, you just meet someone, and you can’t quite figure out why they smell like pumpkin and wet dog when it’s june, it’s weird, it’s confusing, and really just distracts you away from paying attention to what they’re saying)
finally and perhaps most importantly: common sense. you don’t need to be a philosopher or a rocket scientist, but knowing why it’s stupid to ask a running where he’s going is required. we all have brains, and we’re all capable of using them. common sense takes nothing more than patience and attention to detail, not having that trumps any other redeeming qualities.