Karen/Manga/PA/History

Past
Karen, along with Will,, , Sham, and Carl, was one of the children raised by the Masked Man to be his servants. Unlike Silver and Green, Karen was not kidnapped and went to the Masked Man willingly out of boredom.

Karen debuts with Will at the Ilex Forest, where they were tasked to guard the area. When Green arrives to stop the Masked Man's plan to capture, she is attacked by Karen and Will. With the they borrowed from the Masked Man, Karen and Will exploit Green's fear of birds to torture her. When Green learns that Karen and Will also defeated and captured Silver, she overcomes her fear of birds and sends out, , and to fight. Green and her allies, and, each use one of the legendary birds to battle against Karen and Will. With the assistance of many Pokémon sent from all across Johto and Kanto, Ho-Oh and Lugia were freed from the Masked Man's control and fly away. Defeated, Karen made her escape.

After the Masked Man's defeat, Karen and Will were approached by Bruno and Koga, who offered to form an alliance since all four of them were once members of various criminal organizations.

It is revealed that Karen, Will, Bruno, and Koga were all made members of the Johto Elite Four by the Pokémon Association. The Johto Elite Four went to the Pokéathlon as an act of promotion for the Pokémon League. There, they met, who they challenged to the Power Course. Karen was the only Elite Four member who didn't participate in the events.