Easily one of the more...visual...Batman villains, the White Rabbit may seem (and look) like a joke, but, this character actually has some interesting powers.
Jaina Hudson has the ability to complete separate herself into two different beings. One being herself, and the other being the White Rabbit. Not unlike the Alice in Wonderland character, the White Rabbit has increased speed and agility. Hudson herself is incredibly smart, and created a toxin to remove fear. The White Rabbit would constantly taunt Batman before escaping, and in one case, she actually beat him.
The White Rabbit is still considered a bad joke amongst diehard Batman fans, but there's no denying was she has accomplished.