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In Otomedius Excellent, Hikaru and Akane make an appaearance as Ruby and Cobalt which are the two androids in the Dark Dimension. The bunnygirl duo joined up with Dark Force and the Bacterians for their serious mission in Space-Time Dimension while you defeat those core before you enter her dangerous world. Ruby and Cobalt pilot the Metal Slave core.
Ruby is voiced by Asumi Kana and Cobalt is voiced by Noriko Shitaya.