I might have just accidentally discovered Gentei's name.
So inside Chai's room of the old castle, by cheating you can see a newspaper hanging on the wall.
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Here's what it says:
一九八七年五月二七日 星期六 蚩尤日报 (Saturday, May 27, 1987, Chi You's Daily)
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鸟舞 蚩尤日报 (Niaowu - Chi You's Daily)
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偉大的領導人藍帝回到了鳥舞 (The great leader Lan Di has returned to Niaowu)
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鳥隼小姐今天也很漂亮 (Lady Niao Sun looks gorgeous today as well)
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斗牛先生 一名在香港受傷的日本人 受重傷 (Mr. Douniu was seriously jnjured by a Japanese in Hong Kong)
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亀蛇同志長期出差為己任 (Comrade Gui She regards long-term trips as his responsibility)
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The name 亀蛇 (Gui She) can be literally translated as "Tortoise Snake" which is exactly the symbol of Genbu, the power held by Gentei.