- Kasumi
- Keiji Inafune
- Kelberos Cannon
- Kelbeross
- Ken Ishigami
- Kenji Mozu
- Key of Courage
- Key of Pegasus
- Key of the Decayed Soul
- Key of the Insect
- Key of the Lion
- Key of the Lioness
- Ki
- King Quator
- Kitetsu
- Kitsune Courtesan
- Knife Man
- Kongou Iron Brew
- Koshimaru's Notebook (1)
- Koshimaru's Notebook (2)
- Kumori
- Kunai Scroll
- Kureha
- Kureha's Room Key
- Kurobo
- Kusari-gama
- Kusari-gama (Ninja Gaiden II)
- Kû no Tani
- LOA Terrorist
- Lab Stronghold
- Larva
- Legendary Black Falcon
- Lesser Shadow Demon
- Lesser Shadow Ninja
- Letter from Murai
- Life Elixir
- Life of the Gods
- Life of the Gods (Ninja Gaiden)
- Lily Key
- List of Dragon Sword Techniques
- List of Ninja Gaiden characters
- Lives of the Thousand Gods
- Lives of the Thousand Gods (Ninja Gaiden)
- Lives of the Thousand Gods (Ninja Gaiden II)
- Lizard Mountain
- Lock-On Bow
- Lords of Alchemy
- Lovelace
- Lunar
- Lunar Staff
- MSAT Commando
- MSAT Grenadier
- MSAT Riot Guard
- Mace Man
- Magatsuhi
- Magic of Raging Aphrodite
- Magna Fiend
- Malherc
- Marbus
- Marionette
- Martial Artist
- Masakado
- Masked Agent
- Masked Killer
- Masked Pyscho
- Megaselion
- Midnight Assault
- Military Fiend
- Military Supply Base
- Miss Monday
- Missile Turret
- Missions
- Mizuki McCloud
- Mobile Soldier
- Momiji
- Monk Fiend
- Mount Fuji
- Mountain Trial
- Mozu Lineage
- Mugen Tenshin Ninja Clan
- Murai
- Muramasa
- Muramasa's Omusubi
- Muramasa's Shop (Ninja Gaiden)
- N3-SH
- Naga Sotuva
- Navy Base Infiltration
- Netherworld Challenge
- Nicchae
- Ninja (enemy)
- Ninja Gaiden
- Ninja Gaiden: Dragon Sword
- Ninja Gaiden: Master Collection
- Ninja Gaiden: Ragebound
- Ninja Gaiden: Ragebound achievements and trophies
- Ninja Gaiden (Game Gear)
- Ninja Gaiden (Item)
- Ninja Gaiden (Master System)
- Ninja Gaiden (NES)
- Ninja Gaiden (Worlds of Power)
- Ninja Gaiden (Xbox)
- Ninja Gaiden (arcade)
- Ninja Gaiden (series)
- Ninja Gaiden 3
- Ninja Gaiden 3: Razor's Edge
- Ninja Gaiden 3 achievements and trophies
- Ninja Gaiden 4
- Ninja Gaiden 4 achievements and trophies
- Ninja Gaiden Black
- Ninja Gaiden Clans
- Ninja Gaiden II
- Ninja Gaiden II/Image Gallery
- Ninja Gaiden II: Black
- Ninja Gaiden II: Black achievements
- Ninja Gaiden II: The Dark Sword of Chaos
- Ninja Gaiden III: The Ancient Ship of Doom
- Ninja Gaiden II Walkthrough
- Ninja Gaiden II Walkthrough/Chapter 1
- Ninja Gaiden II achievements
- Ninja Gaiden NES Trilogy
- Ninja Gaiden Shadow
- Ninja Gaiden Sigma
- Ninja Gaiden Sigma 2
- Ninja Gaiden Sigma 2 Plus
- Ninja Gaiden Sigma 2 Plus trophies
- Ninja Gaiden Sigma 2 achievements and trophies
- Ninja Gaiden Sigma Plus
- Ninja Gaiden Sigma achievements and trophies
- Ninja Gaiden Trilogy
- Ninja Gaiden Wiki
- Ninja Gaiden Wiki/test
- Ninja Gaiden X
- Ninja Ryukenden
- Ninja Ryukenden (disambiguation)
- Nobleman Fuukisai
- Notebook: Counter Attack
- Notebook: Flying Bird
- Notebook: Flying Swallow
- Notebook: Furious Wind
- Notebook: Invisible Path
- Notebook: Obliteration Technique
- Notebook: Reverse Wind
- Notebook: Shadowless Footsteps
- Notebook: Ultimate Guidance
- Notebook: Ultimate Technique
- Notebook: Unrivaled Soaring
- Numbing Scroll
- Nunchaku
- Obaba
- Obsidrae
- Ogre
- Omitsu
- One of White Test of Valor
- Oni
- Open Sea Chase
- Ourboros
- Outpost
- Owl's Eye
- Oxygen Cylinder
- Pachislot Ninja Gaiden
- Paz Zuu
- Peluda Tail
- Phantasmal Herb
- Phantom
- Pill Bug
- Place of Red Execution
- Pleasure Street
- Prison of the Dead
- Prologue: Legacy
- Propellion
- Purgatory Gate
- Rachel
- Rain of Darkrot
- Raptor
- Raptor, Deity of Sentiment
- Rasetsu
- Raven Clan
- Raven Seal Case
- Red Dragon
- Red Tablet of the Stream
- Regent of the Mask
- Rejuvenation Elixir
- Ren Hayabusa
- Rhyvashi
- Rigid Seal Case
- Robert T. Sturgeon
- Rod of Trials
- Runner
- Ryu's Test
- Ryu Hayabusa
- Ryu Hayabusa's abilities, equipment and titles
- Ryu Hayabusa/Gallery
- Ryu Hayabusa (character file)
- Ryu Hayabusa Relationships
- SAT Commando
- SAT Grenadier
- SAT Motorcyclist
- SAT Riot Guard
- Sabu
- Sabu's Diary
- Sakura
- San
- San's Diary
- Sanji
- Sanzeon
- Saru
- Saru's Diary
- Sea Swallow
- Secret Castle
- Seized by Dark Forces
- Senjin War Brew
- Seori
- Serpent
- Serpent, Deity of Creation
- Shadow Clan Ninja Fortress
- Shadow Fiend
- Shadow Ninja Clan
- Shargelth
- Shield of Vigoor
- Shielder
- Ship Defense System
- Shogun of Darkness
- Shrine Maiden
- Shrouded Moon
- Shuriken
- Shutter Control Card Key
- Silent Tides
- Silver Medallion
- Skull Key
- Skull Key (Ninja Gaiden)
- Sky City Tokyo
- Smaugan
- Smoke Bomb
- Snake Eel
- Sniper
- South American Amazon
- Space of Kelbeross
- Spear Gun
- Spearman
- Spider Aya Ninja
- Spider Ninja
- Spirit of the Devils
- Spirit of the Devils (Ninja Gaiden)
- Spriggan
- Stabber
- Statue Head
- Statue of the Water Spirit
- Steel Prison
- Steel Spider
- Steel on Bone
- Stone Circle Cove
- Stone Golem
- Stone Tablet (Left)
- Stone Tablet (Right)
- Stone Tablet (Top)
- Strongbow
- Strongman
- Substitution Ninpo
- Suke
- Suke's Diary
- Sumo Wrestler
- Super Express to Hell
- Super Ninja
- Sword Armor
- Sword Man
- Sword Ninja
- Tablet of Flame
- Tablet of Leaves
- Tablet of Water
- Tairon
- Takeminakata
- Talisman of Rebirth
- Tamashi Kunai
- Taro
- Taro's Diary
- Team Ninja
- Technique Scroll: Counter Attacks
- Technique Scroll: Guillotine Throw
- Technique Scroll: Izuna Drop
- Tempest Blade
- Temple of Darkness -Hall of Demons-
- Temple of Darkness -Hall of Judgement-
- Temple of Darkness -Hall of the Brahmans-
- Temple of Darkness -The Black Throne-
- Tengu
- Terrorist
- Terrorist (Rocket Launcher)
- Test of Valor
- The Armlet of Benediction
- The Armlet of Celerity
- The Armlet of Fortune
- The Armlet of Potency
- The Armlet of Tranquility
- The Armlet of the Moon
- The Armlet of the Sun
- The Art of the Fire Wheels
- The Art of the Ice Storm
- The Art of the Inazuma
- The Art of the Inferno
- The Art of the Inferno (Ninja Gaiden)
- The Art of the Inferno (Ninja Gaiden II)
- The Art of the Piercing Void
- The Art of the Wind Blades
- The Counter Attack Technique
- The Demon
- The Emperor, Lord of All Creation
- The Flying Bird Technique
- The Flying Swallow Technique
- The Four Greater Fiends, Part 1
- The Four Greater Fiends, Part 2
- The Four Greater Fiends, Part 3
- The Furious Wind Technique
- The Goddess
- The Guillotine Throw Technique
- The History of Vigoor I
- The History of Vigoor II
- The History of Vigoor III
- The History of Vigoor IV
- The Izuna Drop Technique
- The Malice Four
- The Obliteration Technique
- The Prayer of the Necromantale
- The Reverse Wind Technique
- The Rule of the King of Darkness
- The Secret Lab
- The Statue of Liberty
- The Talisman of Rebirth
- The Technique of Shadowless Footsteps
- The Technique of Ultimate Guidance
- The Technique of Unrivaled Soaring
- The Technique of the Invisible Path
- The Tragic Duel
- The Ultimate Technique
- The Vampire War
- The Vigoor Mythology
- The Water Dragon
- Tiger
- Time Freeze
- Tomonobu Itagaki
- Tonfa
- Tonfas
- Troll
- Tsukumo
- Tsutenkaku Samurai
- Type 666 Heavy Machine Gun
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