Mutant (20) is a villain in Kamen Rider - A windflower monster. It can attack with her vines, throw its razor leaves and thorns, and emit pollen. When the Bat Mutant discovered that Kamen Rider BLACK's weakness is his kind heart, the High Priests alongside Anemone Mutant (disguised as a Hanawa Real Estate woman) planned to use Yukari and her family as part of their trap to destroy Kamen Rider BLACK by using a fake house. Kamen Rider BLACK freed Yukari and Battle Hopper from Anemone Mutant's pocket dimension. Once Anemone Mutant was killed by the Rider Kick, the pocket dimension was destroyed and the house that Yukari's family were in disappeared around them.