According to the game's producer and graphics/visual artist Daisuke Ishiwatari in two 1998 The PlayStation (JP) and Dengeki PlayStation magazine interviews, Ishiwatari stated that he originally wanted to ask Koichi Yamadera to voice Sol Badguy, but didn't give him the role. The high cost of hiring Yamadera meant there would not be enough payment for the rest of the game's voice actors who had already been set for their roles, meaning the team couldn't make any further adjustments, so Ishiwatari took on the voice roles of Sol Badguy and Potemkin himself. When asked why they could not have just hired a different voice actor, Ishiwatari responded:

"Well, that was an option too, but I felt like if we couldn’t have Yamadera, I might as well just do it myself. Now I kind of regret that choice, it was a bit impudent of me."
Contributed by ProtoSnake
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