The science genius Rider, Build
Sento Kiryu (桐生 戦兎, Kiryū Sento) is the main protagonist of Kamen Rider Build. He is a physicist who transforms into Kamen Rider Build (仮面ライダービルド, Kamen Raidā Birudo) to uncover the truth behind his mysterious past.
If Reiwa goes for a fusion theme in its anniversary rider season, following Ultraman Orb, Geed & Z, what would be compatible fusion materials? Combining Reiwa riders with a combination of two riders from Showa & Heisei.