Rabbid Rosalina is a Rabbid dressed like Rosalina, and is confirmed as the new playable character in Mario + Rabbids: Sparks of Hope. Not much is known about her at the moment, but she appears to use her stuffed Spark doll as a weapon.
As seen in the cinematic trailer, Rabbid Rosalina appears to be lazy and sleep-depraved but compliant as she answered Mario's call to join. She's described as "smart and ready to battle".
- Rabbid Rosalina Twitter post Date: June 17, 2021.