Jinzo the Machine Menace
Jioh the Gravity Ninja
Jirai Gumo
Jizukiru, the Star Destroying Kaiju
JJ "Kewl Tune"
Job-Change Mirror
Joker's Knight
Joker's Straight
Joker's Wild
Jolt Counter
Jongleur-Ghoul Illusionist
Jormungandr, Generaider Boss of Eternity
Jormungardr the Nordic Serpent
Joruri-P.U.N.K. Dangerous Gabu
Joruri-P.U.N.K. Madame Spider
Joruri-P.U.N.K. Nashiwari Surprise
Jowgen the Spiritualist
Jowls of Dark Demise
Joyous Melffys
Judge Man
Judge of the Ice Barrier
Judgment Dragon
Judgment of Anubis
Judgment of the Branded
Judgment of the Desert
Judgment of the Pharaoh
Judgment of Thunder
Judgment, the Dragon of Heaven
Jumbo Drill
June Pride - Elfnotes
Jungle Dweller
Junk Anchor
Junk Archer
Junk Armor
Junk Barrage
Junk Berserker
Junk Blader
Junk Box
Junk Breaker
Junk Changer
Junk Collector
Junk Connector
Junk Converter
Junk Defender
Junk Destroyer
Junk Dragonlet
Junk Forward
Junk Gardna
Junk Giant
Junk Mail
Junk Meister
Junk Puppet
Junk Servant
Junk Signal
Junk Sleep
Junk Speeder
Junk Synchron
Junk Warrior
Junk Warrior Extreme
Junk Warrior/Assault Mode