A penchant for trouble, The God of Mischief was born through the result of the disruption of rules. It is the essence in which free will goes beyond restraint. As enigmatic and seemingly 'useless' as he is compared to the other Gods, his existence serves a sole purpose:
Freedom.
It's not his fault when humans take the concept of freedom to another level...
Initially, Mischief had no personality and emotions. Like a blank state of a paper, only until time passed with his role as 'God of Mischief', did he gradually gain his own personality. The self-consciousness led him to willingly build his own style, behavior, and even name. He soon self-proclaimed himself as 'Vai', a name short and easy to pronounce with no other particular reasons.