Masako Suzuka (鈴鹿 まさこ, Suzuka Masako) is the main antagonist of Gaim Gaiden: Kamen Rider Gridon VS Kamen Rider Bravo. She is the secretary of Hideyasu Jonouchi who transforms into Kamen Rider Sylphi (仮面ライダーシルフィー, Kamen Raidā Shirufī).