Go Shijima

"Let's... Transform!"

- Go's transformation call as Mach

"Tracking... extermination... both done at mach speed! Kamen Rider... Mach!"

- Mach's roll call

Go Shijima (詩島 剛) is Kiriko Shijima's younger brother and freelance photographer who utilizes Signal Bikes to transform into Kamen Rider Mach (仮面ライダーマッハ), as well as Kamen Rider Drive's Shift Cars for additional power. He had been stationed in America, but returned to Japan to aid with the emerging Roidmude crisis.

Past
Sometime ago, Go and Kiriko lost their parents, with what's left of their father's memorial under a tree. Since Kiriko is the only family member left for him, Go deeply cares for her as much as Kiriko does for him.

He left Japan and resided in America, where Harley Hendrickson, Krim Steinbelt's mentor recruited him to test the Mach System he made. During his days in America, he met one of Krim's Shift Cars, Amazing Circus, and even encountered two Roidmude siblings, Gunman and 018, as he tried to take them down along with their Slowdown syndicate. He chased them to Japan, while at the same time abandoning his training.

Return to Japan
Mach is first seen visiting the Drive Pit on his own, speaking to Mr Belt. Later, when his older sister gets attacked by an evolved Volt Roidmude, he counter attacks him, leaving shortly after Shinnosuke comes to help her.

Go made his first introduction in his civilian form in front of Shinnosuke, who was investigating a Heavy Acceleration in a landshark's house. He challenged the latter in a competition to find the culprit first before disappearing. Despite Shinnosuke and Genpachiro found the culprit, Naoki but Go Shijima appeared and reveal the truth: Naoki is the culprit but the Roidmude they face earlier was a different person. He called Kiriko as she and Drive watched him defeated Gunman easily. Once the battle was over, Kiriko and Mr. Belt introduced Shinnosuke to Go, learning that he is Kiriko's younger brother, much to Shinnosuke's shock.

When three robbers called the Slowdown Gang announce their robbery on the internet with their Slowdown Wristbands from Gunman and 018, Genpachiro assembled a team of SWAT and the Special Investigation Unit members went into action. However, while the robbers were on their way, Go as Mach created his own Heavy Acceleration and interrogated the robbers before destroying their wristbands. Using that information, he infiltrated the Roidmude siblings but got himself caught along with Mashin Chaser until Shinnosuke, Kiriko and his Signal Bikes came to rescue. He transformed into Mach and destroyed the Roidmude siblings with their Cores. Shinnosuke finally understood Go's personality and accepted the term "big brother" given to him by Go.

The Ride Crosser & revelation of Proto-Drive's Fate
Shinnosuke and Go receive jobs to guard a model who is bullied by a Roidmude who calls a truce with the stalker of the model. During the job, Chase intervenes but with his non usual emotions for his sake to search for his lost memory. Soon, Chase, Shinnosuke, Go, and Kiriko are shocked to learn the truth of Chase being the first Kamen Rider Drive after Chase is shocked to learn that his machine is able to combine with Go's machine out of his will. This truth also gives Chase more shock. Soon, after continuing the case, Shinnosuke become hesitant to defeat Chase after he was rebooted by Medic.

Type Dead Heat & Confrontation with the Reaper
When investigating marriage scam incidents and battling Voice Roidmude and his minions, Shinnosuke finds Go beaten by a newly healed Heart. Having no choice, he forced himself to use the unfinished Shift Dead Heat and defeated Heart along with killing two of Voice's lackeys. With the Drive System gone haywire, Drive pleads with Go to stop him. Later, while battling against the Voice Roidmude, Chase arrives to cover the latter's escape. Their battle comes to a draw when Mach Arabull and Tune Chaser Bat's Rider Kicks collide. Mach participate in the battle again and for the first time used the finished Shift Dead Heat, assuming Deadheat Mach and destroyed Voice and his lackeys.

During Drive & Mach's confrontation with the Judge Roidmude, Mashin Chaser appears and saves Judge. He then triggered the Ride Crosser combination on his own and resorted to eliminate the Riders. However, Tridoron arrives, allowing Drive to forcibly separate the Ride Crosser. Go as well forced himself to participate in the case again after being duped by the real Judge as his red herring. Chase later returned to aid the Judge Roidmude but is intercepted by Go, who transforms into Mach. Though Chase initially gains the upper hand, Mach overpowers him as Deadheat Mach. Chase attempts to activate the Ride Crosser combination but to no avail, as Mach did not bring his Ride Macher along with him. After Drive defeats Judge, Chase became furious and blasted purple energy from his Fang Spidey at the Riders. However, Mach jumps up into the air and strikes Chase with his Zenrin Shooter powered by his Dead Zone state. Afterwards, Chase retreats.

When five simultaneous murders are reported at the same time, Go as Mach and Drive confronted Chase for the murders, which ultimately ended with them forced to face Medic and her Reaper Legion. As they flee, Mach managed to defeat one member, Roidmude 104. He would later discovered that the murders were just baits used to separate Drive from his allies, with the Tire Exchange Shift Cars under Medic's trance and Mach himself forced to deal with Heart. In the end, he was forced to lend Drive Shift Dead Heat at the cost of his own safety.

"You think I’ll trust a murderer?" "I have never killed a human!" "Don’t lie! I have to defeat all the Roidmudes as quickly as possible. The Roidmude are evil. Do you think I’ll ever believe you?"

- Mach confronting Chase when the latter kidnaps Kiriko to have Drive meet him for a Final Showdown.

Shinnosuke thanks Go for passing Shift Dead Heat to him in the nick of time. Though Go, still not feeling at ease about Chase, leaves. Mr. Belt figures that they need to find a way to finish off the battle as Type Formula without any self-inflicting injury. Back at the Unit, five men appear in the office. Jun thinks that they want to get a driver's licence, but Kyu recognizes them as the victims from the five homicides. Go and Kiriko try to fend off the victims, but Kiriko gets knocked out and carried away by two of them. Mr Belt deduces that the bodies were copies created by Medic, which was how forensics believed that they died at the same time. Beneath a highway, one of the "victims" passes Kiriko to Chase, who then disintegrates all the remaining three victims. He is stopped by Go, who transforms into Mach. As Mach asks Chase how could he toy with human life, it undoes part of Chase's reprogramming back to its original state, causing Chase to put down Kiriko on the ground and step back in shock. As a confused Chase wonders what he has done, Medic appears and renders him unconscious. She sends her Reapers after Mach, who fights them in his Dead Heat form. After the fight, he collapses in exhaustion. He wakes up to find Shinnosuke and Kiriko, and tells the former that Chase wants to fight fair and square. After Drive defeats Mashin Chaser in battle, The Ride Chaser is left at the Drive Pit's possession.

Shuriken Sentai Ninninger Vs. Kamen Rider Drive Spring Vacation Combining Special
In a movie prequel special, Go is seen taking a picture of an unknown phenomenal that is come out of the sky until it dissapeared within few minutes. During his second time finding the phenomena and taking most of the pictures before it dissapeared again, he was encountered by Kamen Rider 3, whom recently attacks Go was only for a test drive as he was spared by Rider 3, and being told that Go wasn't the one he after, but someone else. He shows up rescue Shinnosuke, Kiriko and a Ninninger member, Takaharu from Hiruchameleon's attack, and also telling them about Kamen Rider 3's existence after Go was attacked by him before being spared for some reason as a test drive to test Rider 3's skills for an outcome. He, Kiriko, Shinnosuke, and Takaharu found the mastermind behind phenomena, Shocker, whose Great Leader now resided with Doctor D bodied Roidmude 089 as belt. While aiding his partner and Ninningers defeating the remaining Shocker. However, Hiruchameleon escaped. After the battle during Ninninger's departure, Go still suspicious about who Rider 3 was and what's he up to.

Super Hero Taisen GP: Kamen Rider 3
After Shocker alters the timeline by sending Kamen Rider 3 back to 1973 to defeat the original Double Riders, Go has a job on Super Regeneration System to create something called "Rider Town", until he met Takumi Inui. After his encounter with Takumi, he joined Yuto Sakurai, and the other Rider resistances whose on a run from Shocker. Although, he, Yuto and Shinnosuke also helped out Kyoichiro, whose on a run from both Shocker and Rider resistance recently. He and Yuto later meets Sakuya Tachibana, and one of 3 other main Royal Card Riders, whereas Mutsuki Kamijou becomes an young evil leader of some Shocker's branch, while Kazuma Kenzaki is held as a prisoner. At some point, he fights against Kamen Riders Leangle & Chalice. Go later then participates in the final battle against the Great Leader in an effort to restore the timeline, but overwhelmed by multiple kaijin and killed. He stays dead even with the timeline fixed, with Kiriko and Shinnosuke mourning for his passing.

D-Video Special: Kamen Rider 4
The timeline is altered once again after the events of Super Hero Taisen GP, where time itself is stuck in a strange loop on April 4, 2015. Go is repeatedly killed over and and over again as Shinnosuke attempts to correct the timeline. His death is finally undone when Shinnosuke sacrifices himself to ensure Go's survival.

Restoring the Rider's faith
"I don't have to push myself to get stronger anymore... That's because...I'm already strong!"

- Go regains his faith in himself.

He later gets involved in fight with Shoot Roidmude to make him busy, in order for Drive Type Formula to intercept missiles launched by the Roidmude successfully, but Go is defeated following the berserker state of Deadheat Mach having his belt critically damaged, but repaired afterwards by Rinna Sawagami. Go, seeing both the Roidmudes and Drive consequently recieving upgrades, goes furious out of jealousy and begs Rinna to power up his Mach Driver as well. But Mr. Belt reassures Go, that Mach Driver Honoh works in the same principal as Drive System does and that the Mach System is just as capable of evolving, implying that he missing something. Realising, thanks to Kiriko, that he's already strong enough, Go calls off the impending power-up, having restored faith in himself (which was lost in waves of impatiency) granting Rider to access Sudden Dead Heat function, which causes Deadheat Mach form to go berserk on user's own will, with being able to control the Rider form in burst. Thus, he and Drive were able to finish the Shoot Roidmude once and for all.

After Go leaves the Drive Pit, Rinna reveals to have second Mach Driver to carry her experiments on.

Personality
Go has a very impulsive and outgoing personality, whose hyperactivity may have worsened during his time in America. He is also very intelligent, which coupled with his robust physique, makes him a very capable detective. He is also pretty competitive, as seen with him challenging Shinnosuke to find and finish Gunman. A freelance cameraman himself, Go has a habit of picturing any nearby couples either intentionally or not.

He has a flair for drama and is also quite the jester. Despite being entirely capable of subtlety, he prefers to make his entrance in a proud, flashy manner, going so far as to call his sister to his debut battle in Japan, just so that she can witness how cool he is. These traits ultimately resulted in him liking to rush into danger.

Go has a catchphrase that goes, "Tracking, extermination, both done at Mach speed! Kamen Rider Mach!" (追跡、撲滅、いずれもマッハ！仮面ライダーマッハ！)

In his battles with the Roidmudes, he likes to repeat his introduction of himself whether he starts fighting, even though he has said it in Episode 12 already, presuming to show off the coolness of himself. However, as shown in Episode 14, in his first fight with Roidmude 096, he is so determined to finish his introduction that he gives the Roidmude a chance to attack him, and even escaping. In his next encounter with him and Roidmude 069, he skipped it and goes straight to the fighting part. He fixed this problem afterwards in future episodes by saying it really fast.

For all of his bluster, however, Go is also a realist, ready to use any means to defeat his enemy, even considered himself much of a monster as the ones they fight due to the fact that both the Kamen Riders and the Roidmudes use Core Driviars as the source of their powers.

He does have a serious side, especially when it is to protect his sister from dangers and harms. He has a big hatred to the Roidmudes that's near fanatical in belief, hating even Chase. He is also annoyed to see his sister and Shinnosuke still finding a way to save Chase, even though he was the Kamen Rider that saved his sister's life. His hatred for Roidmudes is so great that he even went so far to say that Chase is just the 109th Roidmude, ignoring his past heroics as Proto Drive. In Episode 22, even when Chase temporarily got back to his original settings, he still doesn't budge, continuing his thoughts about all the Roidmudes are evil, unaware that it was all Medic's plan to lure Drive out. However, he does show a little bit of sympathy to Roidmude 072 back in Episode 20, but those feelings were only temporary.

Powers and Abilities

 * Peak Human Physicality
 * He has a very athletic physique - a trait he shares with his sister. He easily demonstrates acrobatics way above that of average human's, shown to be able to somersault over tall walls, hand-standing for minutes on end, jumping from a tall tower to a roof over a great distance, then landing safely on his bike.


 * 4th Wall Awareness
 * During his debut, he could comically see and interact with Shinnosuke's imaginations, which are supposed to be seen by the viewers only. He is also currently the only one to do so.

Family

 * Kiriko Shijima - older sister
 * Sukimo Shijima - late father

Forms
Some of Kamen Rider Mach's Signal Bikes alter the suit based on a certain attribute, whereas other Signal Bikes arm him with a certain element or weapon, by changing the Kourin Signal (コウリンシグナル) on his right shoulder for a Signal Exchange (シグナル交換). These two types of Signal Bikes can be used in conjunction with each other. Mach can also use Kamen Rider Drive's Shift Cars for the same effect through a Tire Exchange (タイヤ交換).

By hitting the Boost Igniter on the Mach Driver Honoh between one and four times, Mach can activate the special ability of a Signal Bike or Shift Car currently placed within the Driver. After raising the Signal Landing Panel, pressing the Boost Igniter, and pushing the Signal Landing Panel back down, Mach can unleash a Full Throttle (フルスロットル) finishing move.

Kamen Rider Mach's ending theme is entitled "Full Throttle".

Equipment

 * NEX-Core Driviars - Kamen Rider Mach's power source, an upgrade of the Core Driviars

Devices

 * Mach Driver Honoh - Transformation device
 * Signal Bikes - Gives access to Mach's forms and powers, depending on which bike is used
 * Shift Cars - Borrowed/taken from Drive to give Mach additional forms and powers

Weapons

 * Zenrin Shooter - Mach's primary weapon
 * Tire Specific Items - Weapons that come from certain Shift Cars (borrowed from Drive):
 * Rumble Smasher - Mach Arabull's drill-based item via the Kourin Signal Arabull
 * Cure Quicker - Mach Naoru's first aid kit-based item via the Kourin Signal Naorl

Vehicles

 * Ride Macher - Mach's primary Rider Machine
 * Ride Crosser - Ride Macher combined with the Ride Chaser
 * Ride Booster Red - Mach's Rider Machine

Portrayal
Go Shijima is portrayed by Yuu Inaba (稲葉 友).

As Kamen Rider Mach, his suit actor is Jun Watanabe (渡辺 淳). This is his second time suit acting for the Secondary Riders. The first was Kamen Rider Beast.