I made a new black cat oc who is best friends with Rika and Clover, who happen to be Vivian where she had a backstory with her being a normal girl that starts her life as a friend to the 2 were she likes to make some friends so much. For her parents who are Grover and Doris they loved her even though that she is their angel, until she saw a lab with belongs to a kind mad scienist as he works on some experiments as he tells Vivian to help him have her be his assistant in which she accepts with a happy smile on her face. Later with Rika and Clover come in to show their friend the new forms they got along with their new cute looks, Vivian smiles but wishes to be just like them without warning they saw someone in the lab with a pointy nose turn out to be Snivley that he wanted to steal the blue prints for robots that he must give to Eggman. As the short robotnik got them as he sees Rika and Clover in front of them to stop his evil deeds to help his uncle with him getting ready to fire a weapon at the 2, Vivian comes and kicks Snivley but got zapped by him when he used the lab's dna experiment lasers that merged it with black cat dna on her in which her parents came with help from Sonic to save the day. When Snivley run off with the new blue prints to show Eggman along with his move to escape, the white cat and poodle see their friend was in the room where Grover and Doris trying to help Vivian until she came out showing her new black cat form where looks curious in the mirror although that her parents are human they smiled at her as she moves her tail with a happy look. The only thing that didn't change was her outfit and black heels that are the same the cat girl but got the same wardrobe she wears in her room, including a collar just like Clover and Rika have so she can wear it to stop Eggman. With Vivian enjoying her new look she walks along with a smile on her face to greet everyone what isn't scared of her including getting her new little puppy that the 2 formed a bond with each other as it licked her face causing the cat to giggle, however she meets a giant lamb who is Susie who stomps to meet her where they become friends where the black cat can rest in her wool just like a big bed with help from her gentle giant friend too.