Ryoutarou Tsuboi

Ryoutarou Tsuboi, also known as Klein, is a character from the Sword Art Online series.
== Charactah Account ==
Kirito's first friend and comrade in SAO. After Kayaba trapped them, he and Kirito parted ways to gather his real-world friends, in the process forming "Fuurinkazan", a guild famous for having all of its members survive SAO. Later in ALO, he joins Kirito's party as a Salamander-type swordsman.
Klein is one of the friendliest people in the series and sets the mood when he is around. He never holds grudges against others and is always ready to lend a helping hand. He cares deeply for his friends and always wants to be by their side fighting alongside them when they are in danger even to the point of getting angry when Kirito was fighting Death Gun, saying he should have converted to Gun Gale Online as well. He gets angry when people get into situations that can get them killed since he wants to protect as many people as he can.
Klein is a very loyal person, which is apparent in his friendship with Kirito, despite the latter usually treating him with coldness. Klein is also a "bachelor" and is shown trying to get together with various women in the series, such as Asuna, Freyja, and even Kazuto's sister, whom he had yet to meet. 
== Appearance ==
=== Anime ===
* Sword Art Online
* Sword Art Online II
* Sword Art Online II: Sword Art Offline II
* Sword Art Online Movie: Ordinal Scale
* Sword Art Online Movie: Progressive - Aria of a Starless Night
* Sword Art Online: Alicization
* Sword Art Online: Alicization - War of Underworld
* Sword Art Online: Alicization - War of Underworld 2nd Season
* Sword Art Online: Alicization - War of Underworld Reflection
* Sword Art Online: Extra Edition
* Sword Art Online: Sword Art Offline
* Sword Art Online: Sword Art Offline - Extra Edition
=== Light Novels ===
* Sword Art Online
* Sword Art Online SS: Caliber SS (Failure Side)
* Sword Art Online: Material Edition
=== Manga ===
* Gekijouban Sword Art Online: Ordinal Scale
* Sword Art Online dj - Lisbeth Edition
* Sword Art Online Re:Aincrad
* Sword Art Online: Aincrad
* Sword Art Online: Aincrad Night of Kirito
* Sword Art Online: Calibur
* Sword Art Online: Hollow Realization
* Sword Art Online: Integral Factor - Prologue Comic
* Sword Art Online: Project Alicization
* Sword Art*Online
=== Video Games ===
* Sword Art Online: Fatal Bullet
* Sword Art Online: Hollow Fragment
* Sword Art Online: Hollow Realization
* Sword Art Online: Infinity Moment
* Sword Art Online: Integral Factor
* Sword Art Online: Lost Song
* Sword Art Online: Millennium Twilight
== Trivia ==
* Ryoutarou was one of the hardcore gamers who were waiting for three days in line during the SAO release.
* The author chose to name Ryoutarou's avatar as "Klein" based on an American bicycle company named Klein Bikes.
* In-story, Ryoutarou's avatar name was derived from the term Klein bottle (Kurain no Tsubo), based on his real name Tsuboi Ryoutarou.
* Klein was one of the 10+ players who had the «Katana» extra skill.
* In the 4-koma manga parody of Sword Art Online, Klein is much more prominent and he tends to pester Kirito with messages or calls.
* In all commercially released media Klein first met Kirito on the first day of the SAO official service start, but in the web version, Klein first met Kirito on September, 2013 (2023 in the light novel timeline), three months before the Christmas Event.
* Klein nicknames Kirito as Kiri-no-ji.
== Gallery ==
File:Ryoutarou Tsuboi Render 01.png
File:Ryoutarou Tsuboi Render 02.png
File:Ryoutarou Tsuboi Render 03.png
File:Ryoutarou Tsuboi Render 04.png
File:Ryoutarou Tsuboi Render 05.png
File:Ryoutarou Tsuboi 01.png
File:Ryoutarou Tsuboi 02.png
File:Ryoutarou Tsuboi 03.png
File:Ryoutarou Tsuboi 04.png
== External Links ==
* Tsuboi Ryoutarou at Sword Art Online Wiki
Category:Characters
Category:Males
Category:Sword Art Online