Sakata Gintoki from Gintama is here! And he has a unique mechanic going for himself. Normally his moveset is bit more serious with joke elements here and there, but if his damage reaches over 75% then his moveset will be swapped out to a moveset that is full of references from movies, TV shows, manga, anime, videogames, comics, etc. so this way he represents his series' parody heavy nature while also showing the serious side of his show.
Put the data file into your SSF2's data folder and don't forget to make a backup.