Yamato and Kosaburou, also known as Cassidy and Butch, are minor antagonists. Kosaburou is voiced by Eric Stuart and Yamato is voiced by Andi Whaley.
Characteristics: Yamato- tall, slender, curvy, long ginger hair, purple eyes, beautiful, evil, arrogant, rude, snobby, competitive; Kosaburou- tall, slender, green hair, brown eyes, handsome, evil, easily-offended, short-tempered, arrogant, competitive
Real age: 20 real years
Comes from: Pokémon
Subrace: negative character
- with each other: Most of the time, they treat each other with a lot of respect and trust. They enjoy working together as a team, although, from time to time, they annoy each other with specific things-Yamato annoys Kosaburo with mispronouncing his name and he annoys her with his temper and bragging.
- their respective pets: They usually treat them as their battle assistants.
- Kosaburous's original actor is Takehito Koyasu and Yamato's original actress is Masako Katsuki.
- Kosaburo shares his original actor with Bobobo-bo.
- They are the main antagonists of the episode Butch, Cassidy and the kid.
- Yamato shares her English actress with Minto Aizawa.
- Yamato has a habit of often forgetting the names of other cartoon characters. Sometimes that includes the name of her own partner as well.