(カスミ Kasumi) is the Gym Leader at the Cerulean City Gym, and specializes in Water-type Pokémon. She gives the Cascade Badge to trainers that defeat her.
Misty has also been featured in the Pokémon Anime as a main character in the early seasons (1-5), leading to a strong fanbase for her. Because of her popularity, Misty has been featured in every type of media the franchise has been in. This includes the anime, manga series, toys, music and others.
In the anime
Main article: Misty
In the Manga
"Electric Tale of Pikachu"
Misty has been in several Pokémon manga through the years. She has ranged from being a main character to being one of the minor characters depending on the storyline. She shares some similar experiences with her anime version in "The Electric Tale of Pikachu". Her bike is also destroyed by Pikachu's Thundershock, and she occasionally tags along with Ash in his travels, though it is not as constant as it is in the anime. There are some differences though, including her outfit, and age (12), while she is 10 in the animated series, and the fact that she is not always travelling with Ash. Eventually Ash and Misty battle in the Cerulean City Gym, it is not really a battle though, as the goal is for Ash to retrieve his stolen hat from Misty. Even after this she still follows Ash, in claims that she wants him to pay her back for the bike. It is claimed that Misty has a thing for younger men, Ash, by her sisters after their Gym Battle when Misty is overly harsh with Ash after winning.
Misty's first appearance in a game was in the original games as the Cerulean City Gym Leader. She is given the nickname "The Tomboyish Mermaid" and uses Water-type Pokémon. When defeated she will give the player a Cascade Badge along withTM03 (Water Pulse)
Misty makes another appearance in Pokémon Gold and Silver, again as the Cerulean City Gym Leader. Here, she is a little older from other adaptations and appears slightly different as well.
From information gained from a variety of games, it is known that Misty is always looking for a way to improve her techniques. When she trains, she goes to the Seafoam Islands for herself, and her Pokémon. Misty also has high hopes for Cerulean's North Cape, which is known as a romantic date spot. She also dreams of travelling when she becomes a better Pokemon Trainer.
Misty also appears on Pokémon Channel on a full Japanese Pichu Bros. Disk. It differs from the other Japanese Disk as Misty's (Kasumi's) voice actress is the narrator.