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Well OP, in Japanese games and anime, bosses always need to have a "final form". Because the Japanese have loads of fun and creative ideas when they make stuff but NO TASTE whatsoever, they tend to go completely overboard, often incorporating cultural aspects that are foreign to their country and that they don't really have an understanding of or feel for. This encompasses halos, angelic wings, gothic architecture, hair colors other than black, large breasts and other things they only really know about from seeing it in imported western media.
Couple this with their need for complete and unbridled melodrama in absolutely everything they produce (sersiouly, watch Attack on Titan and count the number of dramatic silences and emotional outburts in one single episode), and you get stuff like an impossibly spiky haired ginger man in a cravatte wielding doctor octopus bees and cybernetic ray bans.
It's a bit like if every movie ever made in Hollywood ended with the bad guy transforming into a huge, gross exaggeration of a 1500th century samurai, shooting ninja stars out of his eye sockets and playing the shamisen while citing ancient shinto buddhism scripture with a broad American accent.
As i westerner who lived in Japan for a long time, let me tell you that it gets very exhausting very quickly.
