Grisha is a purple grung currently living in Riverrock. Like others of her caste, she typically serves administrative functions. The Party met her on their first visit to the ruins, where she acted as their tour guide after mistaking them for visiting traders from Witchmill.
Although lower castes treat her by default with a measure of respect, this does not seem to be shared by her peers or those in higher castes. Grisha seems to be something of a daydreamer and a gossip, but her upbeat personality makes her an exemplary tour guide.