so we know maidens are used as scouts and red shields as police but what about the rest do thunder walkers have a certain role or water seekers

I don't think it's ever explicitly stated. The names might give hints (Water Seekers, scouts?).

Stone Dogs act as rear guards, and other societies make fun of their stubbornness.

Seia Doon as searching for ji ? I got some hints in the series that it might be like that.

Black Eyes- put people to the question

Far deris mai- scouts

Stone dogs- rear gaurd

Red shields- the police force

 

 

well thats confirmation of 4 of the 12, lol. the rest we can only speculate.

Considering 'siswai' is the old tongue word for spear, I wonder what Far Dareis Mai translates to directly.