Tweedledum and Tweedledee

Deever and Dumfree Tweed (a.k.a. Tweedledum and Tweedledee) are two villains from the Batman series. They are cousins, but they could pass as identical twins. They are both overly obsessed with the book Alice in Wonderland. They always work together, whatever they do

Batman: Arkham Asylum
Tweedledum and Tweedledee don't appear in the game Batman: Arkham Asylum. One of the Riddler's riddles revolves around them.

They have an entry in the Character Bios. Their profile states:

Cousins with an uncanny resemblance to each other, Deever and Dumfree Tweed both shared criminal leanings and a fixation on Lewis Carrol’s Alice in Wonderland. Teaming up, they’ve modeled themselves after Tweedledum and Tweedledee from that book, planning often outrageous, absurdist schemes to trap the Batman.

Facts
Real Name: Deever and Dumfree Tweed

Occupation: Professional Criminals

Base of Operations: Gotham City

Eyes: Brown

Hair: Brown

Height: 5 ft 9 in

Weight: 175 lb

First Appearance: Detective Comics #74 (April, 1943)

Attributes

 * Obsession with Alice in Wonderland
 * Skilled criminal masterminds
 * Despite being cousins, could pass as identical twins