Sarah

Sarah is a major NPC in the Pokemon Plasma games and important character in the Plasma universe in general, including the anime.

She was one of, if not the first human character to be designed and went through various changes in importance, going from gym leader to eventually be promoted to Elite Four member. She seems to be one of Zee's favorite creation, seeing as she got a large amount of concept art and was entrusted with some of his favorite Pokemon, including a Kenkachu (which was later scrapped) and a "notched ear" Pichu. Aside from her Elite Four position, Sarah is also a policewomen for Sovereign Co.

Sarah in Battle
"The lightning lord of law" - Sarah's Elite Four title

Through her various character changes, Sarah was consistently portrayed as a competent trainer. Her current position has her sitting as the first member of the Celvice Elite Four. Her team consist mainly of Electric-type Pokemon. Being the most recent and youngest member of the group, her Pokemon are at lower level than the other trainers'. Her character is designed around the theme of "progress", going through a lot of character development and changes throughout the story. Once encountered, the arena the player confront Sarah in is based on a warehouse.

Her signature Pokemon was initially meant to be a Kenkachu but was later replaced by a Dylord.