The Spider Spirit Who Emerged from Build

[I've reached the top of the Kamen Rider world, and I can't keep writing the guest appearances for now. I'll take a chaotic jaunt through the Myriad Worlds first and write whatever comes to mind...]

The lecherous K is Killbus, who appears in the Kamen Rider Build movie "Build NEW WORLD: Kamen Rider Cross-Z". Considered a threat by Oma Zi-O, Killbus is eliminated. Only his clone descends to Earth, and when Oma Zi-O restarts the world, Killbus loses his memories of his original body's death. During the final battle in the original story, “Qitian,” who transmigrates from Earth, takes over the body and restores Killbus's memories from before his elimination. Thus begins his journey of collecting Kamen Rider powers, evolving toward godhood, and venturing into the Myriad Worlds.