Musashi

Musashi (Jessie) is one of the three members of Team Rocket. Her two other teammates are Kojiro (James) and Meowth.

Jessie made her debut in the anime in Pokémon Emergency. Alongside James and Meowth, they set their sights on the injured Pokémon in the Viridian Pokémon Center. Sending out their Ekans and Koffing from their Meowth balloon, they quickly overtook the Pokémon Center, which only had three people inside. Before they could steal any of the Pokémon, however, Ash's Pikachu, who teamed up with many other Pikachu in the Pokémon Center, used an electric attack, causing the entire Pokémon Center to explode. It was here that Team Rocket decided to capture Pikachu, deeming him as an exceptionally powerful Pokémon, and made it their goal to capture him.

Jessie's mother, Miyamoto, was a high-ranking Team Rocket agent. When Jessie was around the age of five, Miyamoto left on a mission to the Andes to record the voice of the elusive Pokémon Mew. However, after Miyamoto disappeared, Jessie was put into a foster home which had very little money. There were times when she had no choice but to eat snow because of a lack of food.

When she was old enough, she left home to become a Pokémon nurse. However, she was unable to go to a regular nursing school and went to the Pokémon Nurse School, which was intended for Chansey. She was quite skilled at things such as bandaging, and even showed a Chansey how to do it, which she quickly became good friends with. However, because she was not a Chansey, Jessie couldn't do things like use Sing to soothe Pokémon, instead falling asleep herself. Ultimately she failed to graduate, and on graduation day she simply packed a bag and left. As she was leaving, Chansey came up to her and offered her her nurses' hat, but Jessie refused to take it. Chansey then broke her egg-shaped pendant she got as proof of graduating in half and gave one half to Jessie so that they would have something to remember each other by. In the episode Ignorance is Blissey, Jessie was reunited with that same Chansey, which had since evolved into a Blissey.

It is assumed that she then enrolled in Pokémon Tech, a Trainers' school, where she met James, and subsequently failed and dropped out. After this, as revealed in The Bridge Bike Gang, Jessie and James joined a bicycle gang in Sunnytown, where Jessie was known for swinging a chain above her head as she rode her bike, acquiring the nicknames "Big Jess" and "Chainer Jessie."