"Mach Full Force!! Go-on Red!"
"Hyper Go-On Red, tune-up! Go-On!"
Sosuke Esumi (江角 走輔 Esumi Sōsuke) is Go-On Red (ゴーオンレッド Gōon Reddo) of the Go-Ongers. Nicknamed the "Speed King," was formerly a race car driver training under Tojiro Fuji.
Possessing a sunny disposition, he was referred to by his racing team as "Miracle Esumi" for his belief in miracles. Unyielding to the point of obstinance and always full of confidence, he confronts all obstacles without hesitation. He is often seen flipping a Go-Onger coin for good luck. When Engine Speedor becomes rusted, Sōsuke crosses paths with his former mentor, who aids him by reminding him that a miracle takes more than one person to make by himself. He is very protective of his teammates; when Saki Rouyama expresses that she wants to be pretty for a boyfriend who will appreciate her and makes a date with a young musician not long after, Sōsuke worries that she intends to leave the team to get married. Sōsuke is thought to secretly like Miu Sutou; in GP 30 ("Friendship's Punch"), while under the influence of a Barbaric Machine Clan Gaiark energy drink, he gives her a ring. However in GP 42 when the other Go-Ongers subtly tell Sosuke that Miu is attracted to helpless men and that he is one of them, he is shocked to hear this. After the final battle, Sōsuke returns to racing, but because of his long absence from the racing circuit, he has to start from the bottom as a go-kart driver.
After transforming into Go-On Red, Sōsuke says, "Mach Full Force!! Go-On Red" (マッハ全開！！ゴーオンレッド Mahha Zenkai!! Gōon Reddo?). Sōsuke and Speedor say, "The Burning Crimson Speed Kings!! We are the Go-On Mach Team" (真っ赤に燃えるスピードキング！！俺達ゴーオンマッハ組 Makka ni Moeru Supīdo Kingu!! Ore-tachi Gōon Mahha-gumi?).
With his high speed abilities, he uses the Mantan Gun in Rod Mode to perform the Go-On Thrust (ゴーオンスラスト Gōon Surasuto), which skewers multiple enemies, and the Spin Rod Crash (スピンロッドクラッシュ Supin Roddo Kurasshu). With the Road Saber, he can perform the Saber Straight (サーベルストレート Sāberu Sutorēto), Saber Straight Go-On Rendezvous (サーベルストレート・ゴーオンランデブー Sāberu Sutorēto Gōon Randebū, with the Rocket Dagger), and Saber Spin Crash (サーベルスピンクラッシュ Sāberu Supin Kurasshu). With Go-On Blue with the Cowl Laser and Go-On Yellow with the Bridge Axe, he can perform Go-On Bond Spirits (ゴーオンキズナスピリッツ Gō-on Kizuna Supirittsu) with the Switch Jet Sword Rocket Dagger's.
- Scott Truman - Power Rangers counterpart in RPM.