Black Four

In the original anime of Kimba the White Lion (Jungle Emperor), a group of black leopards known as the Black Four. They work together as a relentless band of attackers, formed of one small and three bigger leopards, and are as menacing as their disturbing appearances suggest.

Role in Series
In the episode "The Pretenders", they are summoned by major villain Cassius/Toto to take down Kimba while the villain claimed to be a good guy working on Kimba's side. Naturally, they were foiled.

The Black Four later reappeared in "The Day the Sun Went Out" where they sabotage Kimba and Leona's attempt to transfer their ancestors' preserved hides to another shrine. They cast logs down the river that they must ascend, which nearly causes Kimba, Leona, and their okapi allies to go over the waterfall, losing some of the hides in the process. When Leona goes on to collect the rest of the hides towards the shrine, the Black Four capture her and entrap her in an underground tunnel. Fortunately for her, Kimba arrives although he is wounded by the Black Four's constant attacks and knocked into the tunnel. The two manage to escape via a river flow beneath and go back into the chamber just as the Black Four attempt to do away with the hides. Kimba and Leona fight the Black Four and, with the aid of oncoming friends and allies, they defeat the black leopards and force them to retreat into the tunnels below.

Trivia

 * There exists a deleted scene of the Black Four's Villain Song where they make their first appearance after being summoned by Cassius/Toto.
 * They share similarities with some unusual Disney characters, such as bearing Cheshire Cat grins and their villain song being somewhat reminiscent of "Pink Elephants on Parade".