Name: 101
Rider Name: Kamen Rider Chaser Over
Age: Fairly old.
Sex: None.
Transformation Device: Mach Driver 
Origin of Powers: Kamen Rider Drive
Forms: [url=http://vignette1.wikia.nocookie.net/kamenrider/images/b/bd/Roidmude029.png/revision/latest?cb=20141018051619]Cobra Roidmude,[/url] [url=http://vignette3.wikia.nocookie.net/kamenrider/images/d/de/MachDefault.png/revision/latest?cb=20141228032325]Mach[/url], and [url=
http://vignette2.wikia.nocookie.net/kamenrider/images/a/ac/KRDr-Chaser.png/revision/latest?cb=20150421052648]Chaser[/url]

Abilities: 
Roidmude: Heavy Acceleration, Finger Lasers, can turn into a giant snake made of cars by ingesting Viral Cores
Rider: As a Rider, he can use the Front Wheel Shooter as Mach, and the Signal Axe as Chaser. Mach's absurdly fast, while Chaser wins in physical power.
Shift Cars/Signal Bikes: Alter the way his weapons function. For example,they change the behavior of the projectiles that the Front Wheel Shooter fires, and add new attributes to the Signal Axe. IE, Spin Mixer + Funky Spike= big ol' spiky mace.

Appearance: See "Forms."
Personality: 101 is very protective of humans and sentient monsters, particularly children. As an officer of the law, he's sworn to bring criminals (including monsters) to justice, and has had his Driver tuned to be non-lethal. Having spent too much time around 072, he's become something of a dork.
Background: A Roidmude seeking evolution, he copied a human trapped in a housefire, hoping to copy the emotion of fear or desperation. What he got instead was the man's desire to protect his children. At school the next day, the children were being bullied by an older child. This led 101 to attack the bully in order to protect them. The new Drive and Mach tried to stop him, leading him to proclaim that he was just trying to protect the children. In response, Drive screamed that "EVERYONE IS SOMEONE'S CHILD!", leading 101 to undergo a crisis of faith. His new purpose was to protect children. But if all humans were someone's children, then he'd been HARMING children. He ran off to rethink his life.

Later, two Roidmudes would hold the children of the school hostage in an attempt to force his evolution. Not wanting to risk their lives by attacking, he instead begged the Riders for a way to help protect the schoolchildren- and was given the Mach Driver that once belonged to Proto-Zero, the Roidmude Rider. He used it to defeat the kidnapping Roidmudes, placing them under arrest. Soon enough, he was offered a job at the Special Crimes Unit, and the rest is history.