Misty (Japanese カスミ, Kasumi) is very special to Ash Ketchum because Ash and Misty were the first people to travel with Brock and Misty was Ash's first friend. Misty's personality in the anime can be very complex at times. She can be very nice to her friends, but will then quickly change moods, particularly losing her temper very easily. She is quite proficient in anything having to do with water, having ability in fishing, swimming, and overall Water Pokémon training.
Even though she wanted to stay with Ash, Misty felt obligated to do more to help in the war against Fuse. The two went their separate ways, and Misty became a researcher at White Acropolis.