The Nightmare Knights

The Nightmare Knights are a group of former villains formed by Princess Luna.

Members

 * Princess Luna (founder and leader until her retirement)
 * Stygian
 * Tempest Shadow
 * Trixie (Until joining the Irelanders)
 * Capper (Until joining the Irelanders)
 * Tetrax Shard (Third In-Command later Second In-Command)
 * Devlin Levin
 * Hex
 * Reinrassig III
 * Bivalvan
 * Galapagus
 * P'Andor
 * Andreas
 * Ra'ad
 * Antonio
 * Ester
 * Fistina
 * Alan Albright
 * Helen Wheels
 * Manny Armstrong
 * Skurd
 * Ship
 * Jumba's Experiments
 * Gantu
 * Justin
 * Zane
 * Bobby
 * Tina
 * Kristen
 * Visceron
 * Villamax
 * Loyax
 * Diabolico
 * Loki (PR LR)
 * Ransik
 * Nadira
 * Frax
 * Notacon
 * Jindrax
 * Toxica
 * Zen-Aku
 * Kapri and Marah
 * Koragg the Wolf Warrior
 * Necrolai
 * Leelee
 * Itassis
 * Matoombo
 * Whiger
 * Tenaya
 * Rico the Robot
 * Heckyl
 * Anastasia Tremaine
 * Cedric the Sorcerer
 * Princess Ivy
 * Calista
 * Miss Nettle
 * Lucinda
 * Prince Hugo
 * Jasiri (Second In-Command later leader)
 * Hordak
 * Janja
 * Cheezi and Chungu
 * Nne
 * Tano
 * Mzingo
 * Makuu
 * Vitani
 * Shabaha
 * Kasi
 * Imara
 * Tazama
 * Bebop and Rocksteady
 * Juniper Montage
 * Wallflower Bush
 * Gloriosa Daisy
 * Vignette Valencia
 * Sable Spirit
 * Yellow Diamond
 * Blue Diamond
 * White Diamond
 * Spinel
 * Sonata Dusk (As of The Irelanders' Quarantine Adventure)
 * Jetstorm (As of The Irelanders' Quarantine Adventure)
 * Thrust (BM) (renamed Motorblaster) (As of The Irelanders' Quarantine Adventure)
 * Tankor (As of The Irelanders' Quarantine Adventure)
 * Onslaught (As of The Irelanders' Quarantine Adventure)
 * Swindle (As of The Irelanders' Quarantine Adventure)
 * Brawl (As of The Irelanders' Quarantine Adventure)
 * Blast Off (As of The Irelanders' Quarantine Adventure)
 * Vortex (As of The Irelanders' Quarantine Adventure)
 * Hun-Gurrr (As of The Irelanders' Quarantine Adventure)
 * Rippersnapper (As of The Irelanders' Quarantine Adventure)
 * Blot (As of The Irelanders' Quarantine Adventure)
 * Sinnertwin (As of The Irelanders' Quarantine Adventure)
 * Cutthroat (As of The Irelanders' Quarantine Adventure)
 * Maximilian Pegasus
 * Marik Ishtar
 * Vetrix
 * Starscream (Unicron Trilogy)
 * The Serpentine
 * Lord Garmadon
 * Megatron (Prime)
 * Knockout
 * Skyquake
 * Dreadwing
 * Predaking (Prime)
 * Skylynx
 * Darksteel
 * Slipstream (Cyberverse)
 * Clobber
 * Soundwave (Cyberverse)
 * Shadow Striker
 * Lockdown (Cyberverse)
 * The Seekers (Cyberverse)

Trivia

 * The Nightmare Knights are not only a team of former villains but also part of the Irelanders.