Tuo Lei isn't a "hidden boss" character, he's simply just a regular unplayable opponent. His AI does not make use of all his moves such as walking because he lacks animations for them. Also worth noting that you don't need to use hex edits or whatever to play as him, you can simply just rename the character files to do so. His home stage is either a plane or a field, depending on your version of the game I presume. He's also probably one of the easiest opponents to beat in the game, too.
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Tuo Lei isn't a "hidden boss" character, he's simply just a regular unplayable opponent. His AI does not make use of all his moves such as walking because he lacks animations for them. Also worth noting that you don't need to use hex edits or whatever to play as him, you can simply just rename the character files to do so. His home stage is either a plane or a field, depending on your version of the game I presume.
He's also probably one of the easiest opponents to beat in the game, too.