Phillip Aida-Kiryu (Stranded Scientist)

Phillip Aida Kiryu (フィリップ・アイダ桐生) is the main protagonist of Paradius: Tale of a Hero, and a fourteen-year-old individual who lost his memories, fighting as Kamen Rider Build (仮面ライダービルド) in order to restore his memories, and peace.

Early Life
Born in the town of Oogai on the 6th of November, Phillip was a shy and withdrawn child who lived the life of a reclusive person, before meeting his childhood friend, and later wife, Mana, helping him to break free of his shy nature, and becoming really close to her.

However, at the age of four, he was experimented on, losing most of his memories as a side effect. Staying by his side until the age of fourteen, Mana would accompany him into Oogai Middle School, where he witnessed her first transformation into PreCure Heart. Acknowledging the existence of magic, he became a close ally to the Doki Doki Precures, joining them on their multiple adventures.

Advent of Kamen Rider Build
Years later, Phillip would eventually stumble upon his parents' research and plans for the Rider System, and the transformation trinkets used, the FullBottles. Deciding to complete the device that had merely been in the planning for years, he would then use it to become Kamen Rider Build for the first time.

Personality
Phillip is a sweet person, and is generally considered to be a genius, stemming from the fact that he was the creator behind the Build Driver, and many of the transformation trinkets used by the other Kamen Riders. Besides that, he is also a skilled hacker, having achieved interesting feats, such as hacking into Chronicle X's system to free Maki, even with its strong firewall.

Weaknesses

 * Overworking: Phillip has a tendency to overwork himself from time to time, which does bring the worry of his allies.

Devices

 * Build Driver - Main transformation device.
 * FullBottles - Main transformation trinkets.
 * FullBottle Holder - Carrier strap for Phillip's FullBottles.
 * Hazard Trigger - Phillip's power-up device, used to either upgrade into his Hazard Forms, or used in conjunction with the FullFull RabbitTank Bottle to access RabbitRabbit and TankTank.
 * Build Phone - Build's personal smartphone that can transform into the Machine Builder.

Weapons

 * Handheld Weapons:
 * Drill Crusher - Build's personal drill-like weapon accessed by any form.
 * Hawk Gatlinger - Build's gatling rifle-like weapon accessed by any form that uses the Taka or Gatling FullBottles.
 * 4Koma Ninpoutou - Build's katana-like weapon accessed by any form that uses the Ninjya or Comic FullBottles.
 * Beat Closer - Cross-Z's sword-like weapon, utilized during Build's transformation into KeyDragon and KeyDragon Hazard.
 * Kaizoku Hassyar - Build's bladed bow-like weapon accessed by any form that uses the Kaizoku or Densya FullBottles.
 * Fullbottle Buster - Build's personal sword-like and pump-action shotgun-like weapon, accessed by RabbitRabbit and TankTank.

Vehicles

 * Machine Builder - Build's personal Rider Machine that is transformed from the Build Phone.

Allies

 * Mana Aida Kiryu: A very close friend dating back to their childhoods, the two friends were there for each other during rough times, eventually confessing their love another and remain as such to this day.
 * Ryuga Banjou: The secondary to Phillip's primary, the two Riders get along very, frequently working together in combat.
 * Shadow Banjou: Phillip is generally considered a very close friend of Shadow, and the two get along very well.
 * Regina: The two were former enemies back before Regina joined the advent of Paradius, but after her defection, the two became close friends. Besides Mana, Phillip is one of the few people that know Regina very well, knowing who she used to be.
 * Aelita Schaeffer: Another of Phillip's close friends and teammates, the two are both great with computers, and agree on what needs to be done.
 * Sento Kiryu: Phillip's alternate universe counterpart, they both get along well, aside from the two of them being geniuses.

Enemies

 * Ira: Phillip's only known foe, a selfish trio who used to give him and the Doki Doki PreCure trouble. The hate is mutual, and they fight whenever they see each other.

Rider No.
As the leading rider protagonist of Paradius: Tale of a Hero, Phillip is labelled as Paradius Rider #1 (パラディウスライダー1号).