Shikha-Sameera and Sunaina-Sapna really are parallel characters. Shikha and Sunaina, we only don't like them b/c they came in between of the "heroes" love interests. Neither of them is bad per se. Sunaina is more prone to taking harsh and selfish steps and Shikha is more self-destructive...both are very ziddi! And Sameera and Sapna are more self-righteous, strong, and ambitious. I guess all have their good reasons to be the way they are.