Hazbin Hotel fans widely debate who owns Alastor’s soul. Based on recent season 2 developments, the strongest canonical indication is that Rosie holds the contract to Alastor’s soul, due to a backstory sequence where Alastor makes a deal with Rosie and dies, resulting in her possessing his soul as part of the deal and still enforcing terms in the present. This interpretation is reinforced by in-universe exchanges showing Rosie puppeteering him and the lingering leverage she has, which explains why Alastor remains bound or limited despite his power. Key points distilled

• Backstory reveal: Alastor makes a deal with Rosie for power while still alive; Rosie claims his soul upon descent to Hell.
• Present-day implication: Rosie’s ownership creates a contractual leash on Alastor, limiting his actions and driving plot tensions around how long the deal lasts and what remains owed.
• Alternative theories exist: Some fans propose Lilith or Roo as owners, or that ownership is shared or unsettled, but the strongest evidence in recent material points to Rosie as the owner due to the direct contractual dynamic shown in flashbacks and subsequent scenes.

If you’d like, I can pull up and summarize the most recent episode synopses or canonical panels that address this question, or compare competing fan theories with direct quotes from the show’s dialogue.