This is the way I would make Jaunes sisters. (I'm sure RT would too, if RT would get off their asses and give JNPR some spotlight).
Bianca Arc- Jaunes oldest sister. She is the strongest warrior in their family. She does not want Jaune to become a warrior because she doesn't think he is capable and can't take care of himself, but she does love him very much.
Olivia Arc- Jaunes second older sister. Olivia is the mother-figure of the group. She always treats Jaune like a child. Her fighting style is based on dancing. Everyday Jaune is at Beacon, she worries that he will get hurt. She does believe that he is capable of being a huntsman, but still worries about her baby brother.
Rosemary "Rose" Arc- Jaunes fraternal twin sister. Rose is a major tomboy. She loves battle and is always seeking a fight. She gets a kick out of pulling pranks on Jaune, giving him a hard time and humiliating him. Although she does not show it, she loves her twin brother above all else. She is also a talented artist.
Karen Arc- Karen is one year younger than Jaune and Rose. Karen is the brain child of the family. She loves working with machines. She has a genius-level IQ. She is always creating weapons and all sorts of high-tech gadgets. Her battle style is using her brain. She sees always uses Jaune in her experiments, but she does love her brother.
Aqua Arc- Aqua is a fairy tale fan girl. Aqua is always reading stories of brave knights and beautiful princesses. She has always seen herself as the princess and Jaune as her brave knight coming to her rescue. When Jaune said he wanted to be a huntsman, she supported him the most.
Violet Arc- Violet is the goth girl of the family. While she does not like the Grimm, she does find them fascinating. She is a total dark-freak(she and Blake could get along very well). She is not good with feelings, but she does love Jaune.
Jade Arc- Jade is Jaunes youngest sister. Jade has an large brother complex. She is completely obsessed with her brother. She always wants to be by his side and be just like him when she grows up. When Jaune left to go to Beacon, she made him promise to write to her every week. She loves her big brother above all else.
Jaunes sisters are based from the "The Seven Ravens", a story by the Brothers Grimm. While all of them have different personalities, there is one thing they all agree on. If any girl wants to date their brother, she would half to have their approval. Jaune can't date anyone unless they approve of her. (Watch out, Pyrrha). I want to see these girls in the show, but I don't think RT cares enough about JNPR to give them some spotlight. I know we all want to see Jaune and Pyrrha become an official couple, but like I said, I don't think RT cares enough about JNPR to give them any major showtime. There is always hope I guess. For once, let's see JNPR have some epic events. And start by introducing Jaunes sisters.