Another World

Within the Multiverse, Karma Klan's necromancer Nekro has the ability to access several Another Worlds (アナザーワールド Anazāwārudo), which are alternate versions of reality in which past events are altered based on the regrets of their prime universe selves.

Using Another Decade's power, Nekro creates worlds where the battles of defeated villains had different outcomes, effectively bringing them back to life, like how Evolto defeated Kamen Rider Build during their climactic battle in his version of the reality of that world. However, all those vilains, regardless of their true nature, faithfully serve Karma Klan in all its schemes.

Residents
The names are in alphabetical order:
 * Evolto/Kamen Rider Evol (antagonist from Kamen Rider Build) - From a world where Team Build failed to save humanity.
 * Tagitsuhime (antagonist from Toji No Miko) - From a world where all Toji in Japan failed to stop the aradama invasion.
 * Quentin Beck/Mysterio (villain of Spider-Man) - From a world where he is called as Earth's "savior" and defeated Spider-Man during the Battle of London.
 * Sakuya Hikawa/Patren2gou/Patren1gou (power ranger of Keisatsu Sentai Patranger) - From a world where he and the Patrangers failed to save the Lupinrangers and the rest of humanity, thus the only survivor from Gangler's massacre.
 * Yomi Satsuki (anti-heroine Toji from Toji No Miko) - From a world where she defeated her former elite teammates and succeeded the aradama invasion.
 * Yume Tsubakuro (anti-heroine Toji from Toji No Miko) - From a world where she never had sickness and defeated Kanami Eto and Hiyori Jujo from ambushing Yukari Origami.
 * Hal/Titan (antagonist from Megamind) - From a world where he defeated Megamind and dominated Metro City.