Dr. Vent is a minor NPC character who appears in Mario + Rabbids Sparks of Hope, located at Pristine Peaks. He is a male Rabbid who is a scientist. Dr. Vent wears a blue coat, black gloves, and orange hat with black goggles. He has been alone at Pristine Peaks for three days, causing him to go insane. He loses his mind multiple times, and even calls the heroes spies. Dr. Vent also has a lab.

Source: https://www.mariowiki.com/Dr._Vent