Master (Jenny Everywhere vs. the Drag-Racing Monkeys)
The Master and creator of the Drag-Racing Monkeys was an anthropomorphic rabbit and mad scientist who thirsted for world domination in his home universe.
When Jenny Everywhere shifted into his dimension, his Monkeys had already been beaten back by Joe McPhud and his friends once in the past, but they had recently regrouped, ready for another takeover. The Master also captured Limpy and Simpy, robotising them to make them his helpers around his base of operations, although they proved so stupid as to be actively unhelpful.
Ultimately, the bunnies beat the Drag-Racing Monkeys once more (with Jenny's help), regressing many of them into ordinary monkeys using the Master's own Anti-Serum. With his escape route cut off by Limpy and Simpy running off with his spaceship, the Master was taken into custody by the Bunnies, who used the De-Memorizer to erase his memories and then forced him to work for Joe McPhud as a bartender. (COMIC: Jenny Everywhere vs. the Drag-Racing Monkeys)
Behind the scenes
It is probable that this character was named as something else than “Master” (Limpy and Simpy's name for him) in some of the lost pages of COMIC: Jenny Everywhere vs. the Drag-Racing Monkeys.