- "Just Correct!! Go-On Blue!"
- ―Go-On Blue's roll call
Renn Kousaka (香坂 連 Kōsaka Ren) is Go-On Blue (ゴーオンブルー Gōon Burū) of the Go-Ongers. Nicknamed the "Cyclopedia" for his attention to the smallest detail, is a former bus driver who tends to be somewhat talkative.
Because of his doting personality and cooking expertise, he has been referred to as the Go-Ongers' "mother" (オカン okan) by the other Go-Ongers and even his own Engine partner, Engine Bus-on; he takes no offense to and even revels in the reference. The son of a family that runs a beach-side inn, Renn, as a young boy, prayed and offered omelets every day to a guardian statue in the eventually futile hope that his sickly mother would recover. The guardian statue turned out to be the sealed form of the Arerunbra Uzumaquixote, which Renn learned only after Air Pollution Minister Kitaneidas and Water Pollution Minister Kegalesia tried to claim it. Renn carries a small memo notebook, which is the source of his massive knowledge; in it, he jots down notes about and draws doodles of the enemies the team faces, even in the middle of a fight. Not only is Renn the "mother" of the team, but he is also the chief technician; he made modifications to the Engines so they could come together in the Engine-O G6 and Engine-O G9 formations, developed the Kyuyu Soul and the Double Engine Soul Kankanbar, and assisted the Go-on Wings in fine-tuning the Armored Wheel GoRoader GT. After the final battle, Renn becomes Sosuke Esumi's mechanic in the go-kart racing circuit.
As Go-on Blue, Renn's physical strength is magnified. After transforming into Go-on Blue, Renn says, "Just Correct!! Go-on Blue" (ズバリ正解！！ゴーオンブルー Zubari Seikai!! Gōon Burū). With the Mantan Gun in Rod Mode, he can perform the Go-on Drift (ゴーオンドリフト Gōon Dorifuto). With the Mantan Gun in Gun Mode he can perform the Sniper Shoot (スナイパーシュート Sunaipā Shūto). With the Garage Launcher (ガレージランチャー Garēji Ranchā) he can perform Launcher Starter (ランチャースターター Ranchā Sutātā) and Jumping Attack (ジャンピングアタック Janpingu Atakku).
Encountering the Gekiranger, the Go-Ongers lose the Engine Souls to the Gaiark and Meka. With Retsu Fukami and Gou Fukami's help Renn and Hanto manage to gain Geki. With Engine-Ken, a new type of Geki fighting fist, Renn was able to access his beast spirit (which turned out to be Bus-on). With this he performs On On Dan, where Bus-on, apart of his Engine Soul attacks, as a manifestation of will.
Shinkenger vs. Go-Onger
To be added TV STORY-Samurai Sentai Shinkenger vs. Go-Onger: GinmakuBang!!
A few years later, Renn fought alongside not only his own team, but every single Sentai ranger in existence, against the Empire of Zangyack when it attacked the Earth in the Great Legend War. After fighting against hundreds of Gormin and their Zgormin commanders. AkaRenger noticed the fleet moving towards them, he gathered all the Rangers together and gave them the order to sacrifice their powers to wipe out the first invasion's armada. TV STORY-Ep. 1: The Space Pirates Appear TV STORY-Gokaiger Goseiger Super Sentai 199 Hero Great Battle
Farewell Space Pirates
After the defeat of Ackdos Gill, the Gokaiger returned all the Ranger Keys to the former Sentai heroes. Renn and his team have their powers again. TV STORY-Final Ep.: Farewell Space Pirates
Super Hero Taisen
Renn, alongside his team (the Go-On Wings were absent), among the majority of the Super Sentai heroes, was caught up in the "Super Hero Taisen" incident which eventually resulted in the Super Sentai teams and Kamen Riders joining forces to defeat both Dai-Zangyack and Dai-Shocker. TV STORY-Kamen Rider × Super Sentai: Super Hero Taisen
Zyuohger vs. Ninninger
Go-On Blue appeared with his team among the first 38 Super Sentai whom collectively empowered Wild Tousai Shuriken King in its fight against the titanic Gillmarda, granting the Ninningers and Zyuohgers the power to perform the Zyuoh Ninnin Super Sentai Burst which destroyed Gillmarda with the combined power of all 40 Super Sentai. TV STORY-Doubutsu Sentai Zyuohger vs. Ninninger: Message from the Future from Super Sentai
Super Sentai Strongest Battle
Renn joined the Super Sentai Strongest Battle as a member of Gunman Team, where he won the first round after fighting Gosei Pink of Pink Warrior Team. It’s unknown whether he participated in any of the other matches, but his team was eliminated either after losing the second round against the Brain Team or the third round against the Swordsman Team.
Kozukozu Mita cosplays as Renn in the seventh episode of Hikonin Sentai Akibaranger: Season Two. TV STORY-Ep. 7: Delusional Spy
Video game appearances
Super Sentai Battle: Ranger Cross
Go-On Blue appears with his team in Super Sentai Battle: Ranger Cross.
- Renn Kousaka/Go-On Blue: to be added
Super Sentai Battle Base
Go-On Blue is among the vast pantheon of Rangers which are available in the mobile game Super Sentai Battle Base.
Super Sentai Legend Wars
Go-On Blue appears with his team among all Sentai in the mobile game Super Sentai Legend Wars.
- Go-On Drift: where the wheels on his suit began to spin rapidly then laid his front body on the ground, before he slides through it ramming to enemies like a car.
Transformation and Roll Call
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The Go-On Blue Ranger Key (ゴーオンブルーレンジャーキー Gōon Burū Renjā Kī) is Renn Kousaka's personal Ranger Key and what became of his powers after he along with the rest of the 34 Super Sentai sacrificed their powers to end the Great Legend War.
This key along with the majority of the Ranger Keys were collected by the Red Pirates and later used by the Gokaigers. The Go-On Blue Ranger Key was mainly used by Joe Gibken (Gokai Blue), who used it to fight as Go-On Blue.
After Zangyack were finally defeated, the Gokaigers gave the Ranger Keys back to their rightful owners. It is presumed that Renn received his key and became Go-On Blue once more.
Behind the scenes
Renn Kousaka is portrayed by Shinwa Kataoka (片岡 信和 Kataoka Shinwa). As a child, he is portrayed by Shunpei Ijuin (伊集院 竣平 Ijūin Shunpei).
As Go-On Blue, his suit actor was Yoshifumi Oshikawa (押川 善文 Oshikawa Yoshifumi). In Engine Sentai Go-Onger: 10 Years Grand Prix, he was portrayed by Hirotsugu Mori (森 博嗣 Mori Hirotsugu).
In the video game Super Sentai Battle: Ranger Cross, Go-On Blue was voiced by Yugo Takahashi (高橋 裕吾 Takahashi Yugo), who also filled in for Gosei Red.
In the Korean dub of Go-Onger entitled Power Rangers Engine Force, which aired in South Korea, Renn keeps his name, while his Ranger designation is Engine Blue.