Klein

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|-|Sword Art Online=
|-|Alfheim Online=
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==Summary==
Klein (クライン, Kurain) is one of the 10,000 players who were trapped in Sword Art Online and the guild leader of Fuurinkazan (風林火山, Fūrinkazan), one of the clearer guilds. He became Kirito's friend after he asked Kirito to show him how to play Sword Art Online. He later began playing ALfheim Online as a Salamander. His real name is Tsuboi Ryoutarou (壷井遼太郎, Tsuboi Ryōtarō).
==Powers and Stats==
Tier:  in AR/real life.  in VR |  |  | physically, higher with guns | 
Key: Real Life (Ordinal Scale/Augmented Reality) and SAO (Ordinal Scale/Virtual Reality) | SAO (Aincrad) | ALO (New Aincrad) | GGO | UW (War of Underworld)
Name: Tsuboi Ryoutarou, Klein
Origin: Sword Art Online
Gender: Male
Age: 22 (Beginning of Aincrad), 24 (End of Aincrad to Fairy Dance), 25 (Phantom Bullet)
Classification: Human, Guild Leader (Fuurinkazan), SAO Survivor, Salamander (ALO)
Powers and Abilities: Skilled Swordsman, Enhanced Senses (via Hypersense and Distinguish) in AR/real life. In VR he has everything from his ALO key | Superhuman Physical Characteristics, Skilled Swordsman, Enhanced Senses (via Hypersense and Distinguish), Accelerated Development (Leveling; Physical Stats, Abilities), Regeneration (Mid-Low via Battle Healing (Only works in-combat. The stronger the enemy is, the less effective the in-combat regen is). Low-Mid over time (All VR Avatars can regenerate entire limbs within 2-3 minutes)), Damage Boost (All attacks have either a low chance of critically hitting the opponent or hitting a weak point to critically hit them, dealing even more damage. The two forms of critical hits can stack), Statistics Amplification (Sword Skills amplify the user's speed and power, with the downside of having a post-motion stun for a brief period of time afterwards), Status Effect Inducement (via Sword Skills. If one can directly land a Sword Skill on an opponent towards a vital point such as the head, the opponent will be stunned for upwards of 10 seconds), Healing (Accelerating recovery via Recovery Potions over a period of 5 minutes and Healing heavy injuries via Healing Crystals. Healing Crystals act instantly and can immediately bring one back to full HP, even when near-death), Status Effect Inducement Nullification (via Antidote Potions and Antidote Crystals. Antidote Potions only work against debuffs on Klein's power or below), Teleportation & BFR (via Teleport & Corridor Crystals), Immortality (Type 2), Hypermobility (VR Avatars do not have muscles and insides like real people do. Thus, they are able to do impossible motions that people in real life would not be able to do), Limited Reality Warping (via Proto-Incarnation. In times of extreme brain activity reaching to one's Fluctlight, or soul, the user can temporarily enact change on the world to an extent via their willpower or imagination. Usually, it has been displayed to enact improbable feats, such as delaying death, breaking out of system paralysis, bypassing system-enacted rules, and more that can be described as "surpassing the system"), Resistance to Pain (All virtual reality avatars have a pain absorber, which lessens the amount of pain one feels to negligible amounts, even with injuries such as decapitation) | Same as before with the exception of Accelerated Development increasing Physical Stats, Battle healing, and Crystals, with the addition of Flight (Can fly with his ALO Avatar's wings for an unlimited amount of time), Magic (Mostly offensive and fire based), and Immortality (Types 4 and 8. All VR Avatars are able to respawn after being slain, so long as their real life bodies are safe) | Same as SAO Avatar with the exception of Accelerated Development increasing Physical Stats, Battle healing, Crystals, and Sword Skills | Superhuman Physical Characteristics, Skilled Swordsman, Enhanced Senses (via Hypersense and Distinguish), Accelerated Development (Leveling; Physical Stats, Abilities), Statistics Amplification (Sword Skills amplify the user's speed and power, with the downside of having a post-motion stun for a brief period of time afterwards), Limited Reality Warping (via Proto-Incarnation. In times of extreme brain activity reaching to one's Fluctlight, or soul, the user can temporarily enact change on the world to an extent via their willpower or imagination. Usually, it has been displayed to enact improbable feats, such as delaying death, breaking out of system paralysis, bypassing system-enacted rules, and more that can be described as "surpassing the system"), Unconventional Resistance to Soul Manipulation (Fluctlights, the human soul, are referred to as Quantum Fields).
Attack Potency: Average Human level in AR/real life (He's just a regular guy. Was stomped by Eiji). City Block level in VR (Can harm An Incarnation of the Radius) | Building level+ (Comparable to Kirito and other high level players, as there wasn't that big of a level difference between him and other clearers) | Building level+ (Comparable to the rest of the ALO cast) | Street level physically (GGO avatars should be physically superior to real life ones. Can dismember limbs pretty easily and tackle monsters of similar strength), higher with guns (Are accurate to their real life counterparts. Klein has mostly been shown to use machine guns) | Building level (Should at least be on-par with Kirito and Eugeo during the Human Realm Arc, as his Avatar is leveled considerably)
Speed: Average Human in AR/real life. Subsonic travel speed, Supersonic+ combat speed in VR | Subsonic travel speed, Supersonic+ combat speed (Was able to keep pace with monsters and clearers on the 75th floor) | Supersonic+ combat speed and flight speed (Kept pace with Kirito and almost took down an entire raid party alongside him) | Peak Human travel speed (Superior to any normal human), Hypersonic+ combat speed (Comparable to Kirito and other players) | Superhuman (At least comparable to Kirito and Eugeo during the Human Realm Arc)
Lifting Strength: Average Human in AR/real life. Class 5 in VR | Class 5 (Comparable to Kirito) | Possibly Class 5 (Comparable to Kirito) | Peak Human (Superior to any normal human) | Superhuman (Comparable to Kirito and Eugeo)
Striking Strength: Human level in AR/real life. City Block level in VR | Building level+ | Building level+ | Street level | Building level
Durability: Average Human level in AR/real life. City Block level in VR | Building level+ | Building level+ | Street level | Building level
Stamina: Average Human in AR/real life. Infinite physically, Average Human mentally in VR | Infinite physically (Virtual Reality Avatars can never get physically tired; limited only to the mental power of the person themselves), Average Human mentally | Same as SAO Avatar | Same as SAO Avatar | Virtually Infinite physically (Just like normal Virtual Reality Avatars, however, the difference being that if one ran out of "stamina", they would begin taking damage to their Life), Average Human mentally
Range: Standard Melee Range unarmed in real life, Extended Melee Range with his katana in AR and VR, up to Tens of Meters with strongest attacks (Covered massive parts of An Incarnation of the Radius' body), Tens of Meters to possibly up to a Hundreds of Meters with shockwaves in VR | Extended Melee Range with his katana, Several Meters with dash-type Sword Skills | Same as SAO Avatar, with the addition of several meters with fire magic | Several Meters with guns | Same as SAO Avatar
Standard Equipment: 
*The Augma: A device that allows the user to use Augmented Reality technology. Real life only.
*Karakurenai: A katana used by the guild leader of «Fuurinkazan», Klein. This sword uses the «Katana» Extra Skill, which is unlocked by training the «Curved Sword» skill and sufficiently. Klein used Karakurenai up to and including the clearing of the 75th floor of Aincrad.
Intelligence: Above Average (Is able to lead an entire guild. His leadership skills made his guild Fuurinkazan famous for not losing a single member in battle. Klein has proven to be an excellent swordsman as well, showing expertise in his katana skills)
Weaknesses: Sword Skills have a slight post-motion stun at the end of them in exchange for increased power.
Notable Attacks/Techniques:
===Outside System Skills===
Outside System Skills (OuSS): As its name suggests, are skills that are the users own, unlike Sword Skills and magic that are provided for by the game engine.
*Switch: A technique where two Players switch positions in-between an enemy's attack to recover Hit Points, chain attacks together without worrying about an aftercast delay, and/or burden the learning abilities of enemies if they are AIs.
*Hypersense: The act of sensing hostile intention or killer intent, allowing the user to somehow react to attacks done outside of their field of vision.
*Distinguish: Allows the user to eliminate background noise to focus on unnatural or certain sounds around the user.
*Sword Skill Imitation: Imitating the user of Sword Skills without the system's assistance, removing the aftercast delay, but sacrificing the power and speed of the actual skill.
===Sword Skills===
Sword Skills (SS): A series of movements that allows the user to attack much faster than they normally could, but the movements required to perform the Sword Skill are fixed and cannot be canceled by the user after they begin performing it. Contrary to their name, Sword Skills do not have to be used with a sword. Also note that these may not be all of Klein's Sword Skills, but simply most of the ones he has been shown to use. Cannot be used in Alfheim Online pre-New Aincrad (Can only use imitations).
*Reaver: Is a charge-type Sword Skill that delivers a single, fast thrust with a forward jump. The skill is activated by lowering one's stance and raising a one-handed curved sword atop one's shoulder.
*Tsujikaze: After a short period of "charging", the user executes a diagonal slash from bottom-left to top-right at such a speed that it is impossible for the human eye to keep track of the sword.
===Magic===
Magic: Allows the user to use race-unique and Alfheim standard magic. Klein, as a Salamander is naturally inclined towards offensive-based magic and the fire element but he also uses standard elemental magic to imbue his katana with it. Alfheim Online (ALO) Klein only.
*Fire Magic: Although they are capable of learning and using other types of Magic, Salamanders are the masters of Fire Magic, making them capable of casting fire attribute spells exclusive to their race.
==Notable Matchups==
Victories:
Losses:
Inconclusive:
Category:Characters
Category:Sword Art Online
Category:Anime Characters
Category:Enhanced Senses Users
Category:Fire Users
Category:Flight Users
Category:Good Characters
Category:Humans
Category:Light Novel Characters
Category:Magic Users
Category:Male Characters
Category:Manga Characters
Category:Regeneration Users
Category:Science Fiction Characters
Category:Statistics Amplification Users
Category:Sword Users
Category:Weapon Masters