Vortex Bunch

The Vortex Bunch was a 50-year old secret society led by Kaiser Vortex that was active until they were defeated by the Gremory group, resulting in their disbandment.

Summary
The Vortex Bunch was a secret society who were rivals to the Khaos Brigade unbeknownst to Khaos Brigade themselves. The group was founded by Kaiser and his most evil henchmen 50 years ago where in the present day, they knew of the existence of the mythological world as well as the Khaos Brigade's and Qlippoth's activities. Since their inception they had been causing numerous troubles around the world in secret, avoiding the ICPO and when sufficient combatants had been recruited, they had planned to take over all of Japan although the rise of Khaos Brigade foiled their plan. Work of the Khaos Brigade was falsely pinned on the Vortex Bunch, always being accused for their actions. The members consisted of demons, criminals, humans with supernatural powers, and modified monsters and these members dressed head-to-toe in black. The group's catchphrase was to shout "Voooooortex!" while making a V sign with their hands to represent the "V" in "Vortex".

The group planned to take over all of Japan once again, but they were foiled again by the Gremory group during their trip to celebrate Rias' and Akeno's graduation, as well as Issei's promotion to a High-Class Devil. Kaiser, the leader, along with his executives named the Four Invincible Generals were defeated causing the Vortex Bunch to be disbanded with them being handed over to Tobio Ikuse and the Gremory Clan resolving remaing issues.