Maxwell was born in Mouse Village, and for much of his childhood envied and admired the towering size of the Kami. Unfortunately, he was the shortest mouse among his school mates and constantly bullied for his size.
Always curious and smart, Max was obsessed with finding ways to grow and eventually managed to concoct a growth potion in his young adult hood. In a just a day or two, the young mouse had doubled in size and towered over his tormentors. He bullied them back and fucked their girlfriends, claiming them as his.
But Max wouldn't stop growing. As he became larger, he would demand more and more from his friends, family and the village. Food, money, mates. At first it was a symbiotic relationship, as the growing mouse could easily defend the mice from threats such as cats, owls and dogs.
Things came to a head when one day a goblin woman who wanted to play kaiju attacked the village. Max surprised her and pinned her down, fucked her in a show of dominance, destroying several buildings. In the victory ceremony, he forced her and the villagers to feed and tend to his every need, rapidly growing bigger and fatter than ever. As more and more goblins showed up to attack the village, Max realized that the goblins and other humanoids would make much better servants then the tiny mice. Finally, he'd outgrown them.
Following the trail of goblins, Max wandered into one of the towns where the Consortium was fighting the Red Hand, and witnessed terrible goblin on goblin combat. Intent on making all of them serve him, he defeated both parties and learned of the Consortium. When he learned that he could sign up to fight and that he'd have unlimited goblin servants and food, it was a no brainer and he joined Titan Company that day.
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Maxwell is a genius, and it's disputable whether his 'tricks' are magic or technology. The mouse would be inclined towards the latter, devouring engineering texts from Mouse Village, and later on the Ruins of Rhest and imports from Labyrinth. He always keeps an innumerable number of devices on him, including a variable output blaster pistol, holoprojector, commlink, scanner and more.