<P> Fearing that introducing the character as an "(accessory) to the boys" would hinder their chances of successfully integrating her into the series, the writers intended that Ruby should be "a character in (her) own right" and deemed her an antagonist "with (her) own interests and (her) own motives" rather than a love interest to Sam or Dean, which they felt had been their mistake in their introduction of the widely disliked Jo Harvelle in the second season . While they were not planning on a romance between Ruby and either of the Winchesters in the third season, however, they were open to the possibility in the future, with Kripke saying, "If the chemistry is there, and we see the sparks, and we want it to happen, and the fans want it to happen, it'll happen ." Due to "protective and occasionally nervous" fans, Kripke meant to introduce Ruby in "small doses". Wanting fans to know the show would always be about Sam and Dean, and nothing else, he stated, "(Ruby and Bela are) there for important plot elements, but it's not the Ruby and Bela show, nor is it about the four of them cruising around in the Impala together . It's about the guys ." </P> <P> Cassidy originally auditioned for the role of Bela Talbot, but ultimately received the part of Ruby . As opposed to using traditional demonic abilities such as telekinesis, Ruby instead relies on conventional martial arts and her demon - killing knife . Cassidy trained in kickboxing alongside Bela's actress Lauren Cohan to be able to perform Ruby's martial arts skills, prompting her to attempt as many of the fight scenes as she could rather than rely on her stunt double . Before filming for the third season began, she and Cohan decided to watch previous seasons together to catch up on the show . Cassidy also prepared by looking to Sharon Stone's performance in the film Basic Instinct for inspiration due to Ruby's manipulative ways . As Cassidy explained, "(Stone's character) always has the power, and there's this mystery about her ." Costume designer Diane Widas had Ruby dressed in dark colors so that she would blend into shadows, also giving her pleather jackets and narrow jeans to allow Cassidy to be more active . Because of Cassidy's height difference with the lead actors--she is 5'7" while Sam's actor, Jared Padalecki, is 6'4 "--she had to wear tall, spiky high heels that at times made her lose balance . </P> <Table> <Tr> <Td> "</Td> <Td> Rather than introduce some entirely new body for Ruby that'll get confusing for the audience and confusing for Sam, why not keep going back to a performance that we're loving? </Td> <Td>" </Td> </Tr> <Tr> <Td_colspan="3">--Kripke on the decision to keep Cortese . </Td> </Tr> </Table> <Tr> <Td> "</Td> <Td> Rather than introduce some entirely new body for Ruby that'll get confusing for the audience and confusing for Sam, why not keep going back to a performance that we're loving? </Td> <Td>" </Td> </Tr>

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