Fearsome Four of the Dark Dueling World

The Fearsome Four of the Dark Dueling World are a group of Duelists working for Mr. Heartland under Vector and Don Thousand in order to steal the Number cards from Yuma Tsukumo, Shark, and Kite Tenjo.

Members
Each member has an alternate form based on different invertebrates.

Trivia

 * Kurage Senpai is the only member whose true form isn't an insect.