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OK SO Gigan in this au is a member of a species of Giant bird things called Quetgarons that hunt the M space hunter nebula aliens (but in my au they’re just called the Star Bugs).

The climate Gigan’s specific subspecies lived was a more desert-y climate full of sand. So they were very good at digging since the Star Bugs usually dig their cities underground. Their long beaks and tongues also help to snatch up whatever they can get. Quetgarons are far from picky eaters, they perfer organic food, but they’ll eat whatever they can swallow, and recently have even been seen eating metal. They need whatever nutrition they can to keep their massive (generally 60m+ tall) bodies going. And the appendage on their tail is meant to look like their beaks and is used both to fool prey and to grab things.

With the help of a certain other group of Aliens, the Star Bugs created Gigan by capturing a nearly dead Quetgaron and bringing it back to life using certain modifications. A lot of modifications were added to him, like his entire skeleton being reinforced with metal and other materials due to the gravity on earth being greater than their own planet (and also made him a bit taller for shits and giggles). All parts of him that originally had structures made of cartilage (or the similar material they use) are now also coated in metal to make them resistant to Earth’s weapons since originally, they were weak points. Quetgarons have eyelids that cover most of their eyes in order to avoid sand and other gunk getting into them, but these were removed on Gigan and was given a long red visor to protect his eyes instead.

Before Gigan was sent to Earth, he was purposefully starved for a while in order to make sure he’d fuck up as much stuff as possible on Earth. He is the 40th kaiju this earth has ever documented, followed by 41st being Megalon who popped up shortly after Gigan’s arrival. They fucked a LOT of stuff before Jet Jaguar and Mothra were able to take them both down. Gigan now primarily resides in Earth’s deserts reminiscent of his home, waiting for the day where he can fuck shit up again.