Schwarian is a Strange Demon Robot from the Crisis Empire, seeing himself as the ultimate machine in his branch. He is an antagonist in Kamen Rider Decade.
Kamen Rider Build
Super Hero Taisen Z
He revived again as a part of Space Shocker.
Heisei Rider vs. Showa Rider: Kamen Rider Taisen feat. Super Sentai
He was revived again as a member of the Badan Empire.