Sayaka has skills

Sayaka has skills with motorcycles, and hence she is given a special one called the Scarlet Mobile to control Diana; she rides her bike over a beam shot from the robot's head to place it there, turning it into the mecha's cockpit in a manner similar to the Pilder vehicle piloted by Kouji to control Mazinger Z. (Series creator Go Nagai had originally intended for Kouji to link up with Mazinger via a motorcycle component, but changed it to a flying vehicle reportedly to avoid comparison to Kamen Rider. With the Scarlet Mobile and Diana A, Nagai finally got to use this idea.)
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