Tiana is a female Honchkrow singer who entertains one of the local mobs in “The City” and, while not having strong ties to the mafia herself, does rein in on some of their activities.
She is more or less a reimagining and adaptation of Harriet's character.
In A Case of Winging It, she sings at murder events for the Murkrow flocks where she and other singers entertain them. She takes an interest in Kalas' activities after he badly attempts to infiltrate a mob meeting in her presence. She goes unnamed in the original release of the story.
The Director's Cut will expand more on her motivations for taking an interest in Kalas and has her finally be able to meet him in person.
Tiana is largely based off of the character of Harriet from WAAPT, as a counterpart to Copahue's own re-adaptation into the Suocéverse. However a major difference between them is that Tiana never associated with a Trainer.