Some people wanted me to post this. This is how I'm personally doing it and I think it's the most optimal way. This is a way of unlocking all the characters in a fast manner. Make sure to play all classic mode matches on intensity 6.0 or higher. Don't want to be a scrub now. Also be sure to do it in order of top to bottom. I've spoilered it below because there are obviously some spoilers.
The reason why the Classic Mode unlock method was used rather than VS match is because through the use of the bug giving you guaranteed custom items/moves you could essentially take out two birds with one stone.
The reason why the Classic Mode unlock method was used rather than VS match is because through the use of the bug giving you guaranteed custom items/moves you could essentially take out two birds with one stone.
Character Unlock Guide

