Rosie is a thin demon with pale white skin and a really long neck. And, similar to Alastor, she is always smiling. She wears a red dress with gray shoulders and black wrists. Her red sun hat has two skulls and three black flowers on the front side and a large red and black feather on the top side.
- Vivziepop says Rosie and Alastor's relationship is similar to Mary and Jack's relationship from Mary Poppins Returns.
- Vivzie's headcanon voice actor for her would be Barbara Streisand from Hello, Dolly!.
- Faustisse confirmed that there will be a duet with Rosie and Alastor in one of the future episodes of Hazbin Hotel.
- Rosie, in terms of power, is a 2 or 3 on a scale of 1 to 10 according to Fautisse.