Sento Kiryu

"Now, shall we experiment?"

- Build's catchphrase

Sento Kiryu (桐生 戦兎) is a genius theoretical physicist who experiments with Full Bottles to gain new powers as Kamen Rider Build (仮面ライダービルド) to fight against the evil Smash organisms.

History
to be added

Forms
When Sento set the Full Bottles into the Build Driver Belt, to produce Kamen Rider Build. His quote at the start of a battle is "Let's Begin the Experiment!".

Kamen Rider Build is unique among Kamen Riders in that rather than having explicitly defined forms, he instead has mix-and-match powers, this quality only being shared by Kamen Rider Double. Through the different Full Bottles, Build has access to various combinations of powers, weapons, strengths, and weaknesses.

Each different version of Kamen Rider Build has its own finishing attack(s) which is needed to defeat a Smash.

Portrayal
Sento Kiryu is portrayed by Atsuhiro Inukai (犬飼 貴丈).