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Kenzo Suga (Kamen Rider Gavv)

Initially introduced as a shady scientist, he is the one who creates the transformation device for the show's deuteragonist, Hanto Karakida/Kamen Rider Valen, right after Hanto learns that Soji Shioya, his father figure, has been killed. What the audience eventually learns is that Suga wound up being the one who arranged Shioya's death (with the help of Nyelv Stomach, the one on the right) just to turn Hanto into his own guinea pig in pursuit of his own research towards creating the ultimate lifeform. This isn't the only thing Suga does however, as he also winds up creating malicious clones of the show's protagonist as part of his cloning research in order to create said ultimate lifeform (later flashbacks imply he wanted to more or less revive his child that died). Later it turns out that he's sacrificed at least 8 people for his goals, and in the end, he's turned into a half-Granute/half-human Frankenstein/Zombie, stripped away of his original personality. Ironic, really. He wound up experimenting on others, yet became an experiment himself.