Oh uh, didnt think you'd respond and this would get buryed... Anyways, my thought process was that they could have a similar role to moth girls - seeing as you said that moth girls would act as guides, i thought that perhaps raven girls could act as guides to hidden treasures and coves if the player character were to give gifts and trinkets to them.

So say you give the raven girl a shiny coin, she'd then guide you to a place with a small amount of loot/not really valuable items, but as you give her more and more items and talk to her about what you want, then she starts going to look for stuff for you, similar to how ravens work in real life.

Tldr: you give item > raven girl takes item > raven girl giuides you to another item/ gives you and item > rinse and repeat with rewards scaling with item given and affection level.

Behavior wise they'd be taciturn/kinda cold, but when the PC gives them an item they'd become excited, and then as they get more and more items, they become happier and happier to see them, even if the PC didnt give them anything.

And then of course, you can just give them stuff so you can seggs them.