According to the SNK wiki, Geon had an interesting story. In the first game he was a relic from the Cretaceous that was frozen within russian permafrost until bizarre weather patterns thawed him out. Apparently he had low blood pressure in the first game and was still enraged from being awoken several months later. In between games Geon ate irradiated meat from the monsters he defeated, so from Beetle Mania, Rocky and Poison Ghost. Which is hilarious because that means he ate literal rocks, poison sludge & a beetle-like alien's flesh and somehow this allowed him to mutate into the more spiky, draconic appearance seen here. Unlike Atomic Guy and Cyber Woo, Super Geon was just as bad as the aliens with his cruelty and endless appetite. The only thing he couldn't and probably wouldn't eat was Famardy himself. In Neo Geo Battle Coliseum one background of a stage shows the skeleton of Super Geon locked together with the equally lifeless hulk of the original Cyber Woo. Super Geon is canonically the strongest of the three protagonists of KOTM2 so I assume both Atomic Guy & Cyber Woo tried to stop Geon from turning his endless appetite on humanity and the world. I think Atomic guy was defeated but not before injuring Geon enough that he died at the same time as Woo in a draw. Ironically Atomic Guy is the only monster to survive, seemingly merging with Yuki & Ai Ultraman Ace style after losing most of his power & shrinking to his original human size prior to NeoGeo Battle Coliseum. R.I.P Super Geon, a bloodthirsty yet cool looking Godzilla rip-off.
@@luisanunes4365Geon is never shown eating fish, or even being that aquatic. The only thing Geon eats in both games is the flesh of the other monsters in the first game which is how he mutated into Super Geon and the flesh of the aliens when he wins a grapple in KoTM 2. The wiki describes Super Geon as a " cruel monster with an endless appetite. ".