Art is by gekkaneko:
Paula Thunder jr ©:mrsman5: and  sinako777

Marwa Cateye and Paula Thunder Jr. One day, they accidentally swapped their mind into the other's body. Their mothers, respectively Calypso Cateye and Polo Thunder (née Polo Clawson), were very displeased by this, especially Calypso because she is a witch who worship the dark magics. Thus, Marwa's body turned into an angel, while Paula's turned into a devil -- Little Red was created. Thankfully, the problem got fixed, thanks to the Devil, commonly known as Mr. Red, and also Marwa's paternal grandfather. He proposed a deal; Paula would be saved but her soul would be with Marwa's own soul forever. The mothers accepted. And on the next day, all was back to normal, as Marwa and Paula are now not only friends, but sisters-by-soul as well.

Unfortunately, in the future, Paula died of a heart attack. But thanks to the Devil's deal, Paula and Marwa's souls fused and was technically resurrected, as Little Red, also known as Hecate, the devil goddess. On the other side, Momo "Mama Toxin", a mafia leader, took her corpse and turned it into an acid-throwing zombie (as she is herself an acid demon), with the help of Little Red, now named Katty. Kage (Paula's husband) and their children were very thankful to those two.