Yoshimitsu is a wildly unconventional trickster who zigzags the rules of Tekken. Outside of powerful stance-based 50/50s, his main demand is creativity. He is a slippery character able to play a retreating spacing game, heal himself, and escape his opponent's pressure in unexpected ways. However, his conventional tools tend to range from average to mediocre. This includes most of his punishment.
Fortunately he has a deep movelist with many hidden properties to make up for this. If you want to bamboozle your opponent and use a bespoke hammer for each individual nail, there is no better character.