Rosie/Relationships

Alastor
Alastor and Rosie are good friends. In the Hazbin Hotel comic, The Radio Demon, Alastor greets several girls in the Cannibal Colony and afterward asks them to give Rosie his regards.

Alastor describes her as a "dear, charming and dangerous" person who he loves to spend time with. It is apparent that the two get along very well, as they are subsequently seen together, and both enjoy each other's presence. It is also seen that they share several ideas together, and both are always willing to help the other. Rosie is aware of and doesn't mind that Alastor is asexual, despite the Radio Demon being somewhat unaware of his true sexuality.

On Twitter, Vivziepop stated that Alastor and Rosie's relationship is very similar to Jack and Mary's relationship in Mary Poppins Returns.

According to Faustisse, Alastor considers Rosie (along with Niffty and Husk), to be his only close friends. They think that Alastor and Rosie have known each other for a while.

Franklin'
Franklin is Rosie's former business partner. Not much is known about their relationship, but after Franklin is eliminated during The Extermination, Rosie (seemingly delighted) crosses out his name from the sign on their business.

Charlie Morningstar
Nothing is known of their relationship, but as seen in the season one trailer they appear to be allies.