Sharon is researcher for a Biotope Company and assistant to Professor Zed. The movie was released in Japan around the time that the Karen meme became popular around the world, though her name was unintentionally chosen as the meme did not gain mainstream attention in Japan.
While working for the Biotope Company, she realized that Professor Zed had become bad as he tried to get to the source of the regenerative power in the jungle. She stopped working for him once she realized what he was up to.