Otto Cid Bekenstein (オットー・シド・ベッケンシュタイン, Ottō Shido Bekkenshutain?) is a minor character from Final Fantasy Mystic Quest. He lives in Windia, where he operates the Rainbow Road machine. His daughter Norma ventured to Pazuzu's Tower across the Rainbow Road, but was trapped there when the Dullahan caused a wind to blow from Mt. Gale, forcing the Rainbow Road machine to shut down.
Benjamin and Kaeli arrived in Windia, and Otto asked them to investigate Mt. Gale. The two heroes defeated the Dullahan, stopping the wind, and Otto powered up the Rainbow Road machine again. The heroes then ventured to Pazuzu's Tower and rescued Norma.
Following Pazuzu's defeat, Otto suggested that if he had the Thunder Rock, he could supercharge the Rainbow Road machine to reach Spencer's Place. Benjamin recruited Reuben and retrieve the Thunder Rock from Fireburg, returning it to Otto. Otto was successful, and the Rainbow Road extended beyond Pazuzu's Tower to Spencer's Tunnel, allow Benjamin to reach the tunnel and refill the dried lake with the water from the upper lake.
Otto is a given name of Germanic origin meaning wealthy.