Rinna Sawagami

is a scientist with the Special Investigation Unit. 
==History==
===Background===
Rinna Sawagami is a scientist specializing in electronic physics and an honorary member of the Special Investigation Unit of the Metropolitan Police Department. Many years ago, she attended an American college, where she met Kisaburo Sasamoto, a fellow Japanese student who studyed abroad. The two developed a short relationship until Sasamoto was forced to leave her to focus on his studies, which saddened her.
At some point later down her life, Rinna was introduced to Krim Steinbelt and Harley Hendrickson, serving as their assistant involved in the development of the Drive System.
===The Drive Pit Mechanic===
Rinna was eventually employed in the service of the Special Investigation Unit in order to study the risdual sensation that produced density shifts, to which she scientifically coined "Heavy Acceleration". While she is single and is rather impatient on the inside, Rinna has a bright personality and is the mood maker of the Special Investigation Unit. She helps Shinnosuke's investigations as the person in charge of the mechanics by providing equipment that can detect Slowdown particles.
Unbeknownst to Shinnosuke Tomari initally, she was later revealed to be the resident technician of the Drive Pit, helping to develop and maintain Drive's equipment. Outside repairing the Shift Cars, she also invented Drive's weapons like the Handle-Ken and Door-Ju. Rinna had also assisted in developing the new Shift Cars that allowed Drive to advance to his latest Type Changes.
Rinna would eventually reunite with Kisaburo Sasamoto, who she hasn't seen since college. Eventually, it would turn out that Sasamoto had been colluding with the Voice Roidmude while researching his ability to produce a hypnotic sound. Rinna was left heartbroken as her former boyfriend got arrested but was cheered up after Harley Hendrickson gave a present for Rinna and Krim to share before he departed.
She continues to assist Kamen Riders Drive and Mach with their latest upgrades, Shift Deadheat and Shift Formula, in their ensuring fight against the Roidmudes. Eventually, the entire Special Investigation Unit would finally learn of the Drive Pit and their roles in the Kamen Riders' activities. Rinna would also help produce the Signal Bike Chaser and a second Mach Driver Honoh for Chase to become Kamen Rider Chaser. She carries on to invent the Shift Tridoron for Shinnosuke and Krim to advance as Drive Type Tridoron.
Eventually, the Special Investigation Unit have accomplished their mission of shutting down the 108 Roidmudes and ending Tenjuro Banno's reign of terror. With their mission complete, Krim locked himself and all Core Driviar equipments beneath the wrecked Drive Pit. After several parting words, Mr. Belt prepares the lockdown and all of the Unit members saluted for him. Following this, Rinna returned to academia and became an authority figure in the field of electronic physics. She would later go on to win a Nobel Prize in Physics.
==Other Events==
 
===Kamen Rider × Kamen Rider Drive & Gaim: Movie War Full Throttle===
The entire Special Investigations Unit become involved with the "Ultimate Lupin" case concerning the thief being actually a Roidmude. While Shinnosuke procceeded to investigate the case, he discovers that there is a mole amoungst the Special Investigations Unit. After gathering Kiriko, Rinna, Sanjo, Lt. Otta, and Chief Honganji, Shinnosuke exposed Kiriko to be Lupin undercover.
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In the altered timeline created by Shocker's History Modifying Machine, Rinna and Kyu are still members of the Special Investigation Unit which as a police force serves Shocker which rules the world. They are later wanted by Shocker after they witnessed Jun Honganji's murder by Genpachiro Otta, who had been remodeled into the Shocker cyborg Cheetahkatatsumuri. Disguising themselves, they appear as spectators at the Rider Grand Prix where they cheer on the freed Kamen Rider, Drive. Their alternate lives in this world are unwritten when the destruction of the History Modifying Machine restores the timeline, returning them to their proper place in history.
===Kamen Rider Drive: Surprise Future===
When Kamen Rider Drive was engaging in a battle against a Giant Roidmude, he apparently fled the scene after the Trailer-Hou malfunctioned. This forced the Metropolitan Police Department to issue a nationwide manhunt for Shinnosuke, while the rest of the Special Investigations Unit were pleading his innocence. Upon discovering that the entire events have been orchestrated by Roidmude 108, the Special Investigations Unit convince the Metropolitan Police to assist Kamen Rider Drive to prevent the Eternal Global Freeze.
===Drive Saga: Kamen Rider Chaser===
Sometime after the defeat of the Paradox Roidmude, Krim and Rinna were shown to be relaxing with drinks on a rooftop while enjoying a solar eclipse on the roof. When Chase asks Krim and Rinna to implant him with human emotions, they were too preoccupied by the enjoyment of the solar eclipse. However, they both tell him that it would be impossible to reprogram him witch such emotions as it would bring a risk to his programming. While they assure Chase that he's more just than a human ever could be, Chase still aspired for a human heart.
===Kamen Rider × Kamen Rider Ghost & Drive: Super Movie Wars Genesis===
Three months after Krim sealed the Drive technology in the Drive Pit, Rinna would reunite with most of the Special Investigations Unit in the Daitenku Temple as Shinnosuke is stranded in 2005 with Takeru Tenkuji. She would work alongside fellow scientist, Akari Tsukimura, regarding the butterfly effect that is affecting their timeline. When the Kamen Riders reunited to the present to battle Da Vinci Gamma's army, Rinna accompanied everyone else to battle against the army of Gamma Assaults. 
After the battle ended, Rinna attended the wedding of Shinnosuke and Kiriko along with the rest of the former Special Investigation Unit as well as the Mysterious Phenomenon Institute team.
===Kamen Rider Drive Saga 2===
Two years after defeating the Roidmudes, Rinna cooperated with Go in his quest to ressurect Chase. They attempt an an experiment to revive their comrade by using a newly built Proto Body and a blank Drive System, but ends up reviving Heart, Brain, and Medic instead. It is also revealed around the two year interval, Rinna and Lt. Otta are in a relationship together and became engaged. Although Otta's job and Rinna's nagging briefly put a pause in their engagment, they both eventually made amends and intend to marry one day. Rinna, Otta, and Kyu would later spy on Go after he had finally gotten together with Reiko Nishihori.
===Kamen Rider Juuga VS Kamen Rider Orteca===
TBA
==Personality==
Rinna Sawagami is the master genius behind her successful inventions. She is eccentric, intelligent and interested in technology and machines. Although, she was capable of helping Shinnosuke Tomari and his allies in defeating Roidmudes, including Tenjuro Banno.
== Abilities ==
* Gifted Intellect:
* Expert Scientist:
* Expert Engineer:
==List of Rinna's inventions==
*Tridoron: With Mr. Belt's help
*Heavy Acceleration Particle Measuring Device: Used by Shinnosuke and Kiriko to detect Heavy Acceleration particles. So far, only two models existed.
*Handle-Ken
*Door-Ju
*Heavy Acceleration Reducing Machine: Made for Genpachiro to move normally in Heavy Acceleration waves. Later modified it with adding electric-insulation materials after being heavily damaged by the Judge Roidmude.
*Anti-Roidmude Bullets: Bullets specialized to penetrate through a Roidmude's skin.
*Rear Cowl Boots: Kamen Rider Drive Type Speed's boots which she replicated for Kiriko's use to defend herself against the Roidmudes. The boots maximize Kiriko's kicking power to match that of the Rider.
*Shift Dead Heat (Incomplete; completed with help from Harley Hendrickson)
*Trailer-Hou
*Pit Crew Shift Cars
*Second Mach Driver Honoh: Created by reverse-engineering from the original belt. Initially used for her to experiment on but would later be given to Chase.
*Signal Chaser
*Shingou-Ax
*Ride Booster Set
==Relationships==
*Genpachiro Otta - HusbandThey are seen getting together at the end of Drive, and Otta is sporting a wedding ring in Revice: The Mystery.
==Behind the scenes==
===Portrayal===
Rinna Sawagami is portrayed by .
==Notes==
*Her creations were sometimes treated as forms of , due to her attributing random motifs to it. Additionally, she also shows a huge sense of pride when any of her creations aired on televisions.
*Given the "Kamen Rider meets Knight Rider" aspect as told by the producers, Rinna would be the Bonnie Barstow analog of the show as she repairs and maintains the KITT-like Tridoron and develops weapons and gear for the Special Investigation Unit.
==Appearances==
==Navigation==
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