Earth-991

Earth-991 is a reality where Mortal Kombat, Megaman, Soulcalibur, One Piece, Tekken, the Avengers, the X-Men, the Inhumans, the Fantastic Four, Street Fighter, Dead or Alive, and Naruto is combined. The realms include Chaosrealm, Earthrealm.

Avengers

 * Elektra
 * Black Widow
 * Moon Knight
 * Power Man
 * Iron Fist
 * Power Woman
 * Dr. Strange
 * Daredevil
 * Rogue
 * Shang-Chi
 * White Tiger

Edenia

 * Sindel
 * Kitana
 * Jade
 * Rain
 * Tanya
 * Taven
 * Sophitia
 * Ivy
 * Siegfried
 * Taki
 * Kilik
 * Xianghua
 * Raphael

Strawhat Pirates

 * Monkey D Luffy
 * Roronoa Zoro
 * Nami
 * Sanji
 * Nico Robin

Konohagakure

 * Naruto Uzumaki
 * Sasuke Uchiha
 * Sakura Haruno
 * Kakashi Hatake
 * Hinata Hyuga
 * Kurenai Yuhi
 * Shikamaru Nara
 * Choji Akimichi
 * Ino Yamanaka
 * Asuma Sarutobi
 * Rock Lee
 * Neji Hyuga
 * Tenten
 * Might Guy
 * Hashirama Senju
 * Tobirama Senju
 * Hiruzen Sarutobi
 * Minato Namikaze
 * Tsunade
 * Iruka Umino
 * Konohamaru Sarutobi
 * Jiraiya
 * Sai
 * Yamato
 * Kushina Uzumaki

Sunagakure

 * Gaara
 * Temari

Root

 * Danzo Shimura

Kirigakure

 * Zabuza Momochi
 * Haku

Otogakure

 * Orochimaru
 * Kabuto Yakushi

Akatsuki

 * Itachi Uchiha
 * Kisame Hoshigaki
 * Deidara
 * Sasori
 * Zetsu
 * Obito Uchiha
 * Hidan
 * Kakuzu
 * Nagato
 * Konan
 * Madara Uchiha
 * Kaguya Otsutsuki

Taka

 * Suigetsu Hozuki
 * Karin
 * Jugo

Netherrealm

 * Sareena
 * Ashrah
 * Quan Chi
 * Shinnok
 * Noob Saibot

Orderrealm

 * Dairou
 * Darrius
 * Hotaru

Outworlders

 * Li Mei
 * Reiko
 * Shao Kahn

Zaterran

 * Reptile

Shokan

 * Goro
 * Kintaro
 * Sheeva

Tarkatan

 * Baraka

Centaurian

 * Motaro

Osh-Tekk

 * Kotal Kahn

Others

 * Ermac
 * Onaga
 * Mileena
 * Skarlet
 * D'Vorah
 * Ferra & Torr
 * Nightmare
 * Tira
 * Astaroth

Black Dagon

 * Kano
 * Tremor
 * Jarek
 * Kira
 * Kobra
 * Kazuya Mishima
 * Heihachi Mishima
 * Lee Chaolan
 * Jinpachi Mishima
 * Anna Williams

Foreigners

 * Nitara
 * Shang Tsung
 * Erron Black

Red Dragon

 * Daegon
 * Hsu Hao
 * Mavado
 * M Bison
 * Juri
 * Vega
 * Zangief
 * Seth
 * Christie

Connected Realiteis
Because of the Armageddon that befalls this reality, Raiden was able create four other realities
 * Purgatory-A Reality where Liu Kang destroyed Raiden and replaced him as a god.
 * Inferno-A Reality where Liu Kang is emperor of Netherrealm and Raiden is corrupted.
 * Paradise-An Idyllic Reality where the failures of the previous realities were corrected.