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.
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.