Ira Aetheria is a character created by writer SmashUniverse64 and a central figure in their universe, being the world's goddess of darkness. She is a domestic cat with demon horns and is often drawn wearing fishnet stockings and arm gloves as well as a latex leotard.
Bio (taken from her Toyhouse profile page):
Existing since the beginning of Izonian history, the impish Ira is representative of the Aether’s dark half. She has quite a reputation for causing problems. Over the course of Izona’s long and sometimes brutal history, Ira’s mischievous personality has not only caused many minor inconveniences, but sometimes even full on wars to start! While she might consider herself the Queen of All Evil (MWAHAHAHA!), she has almost never directly intervened in the physical world, instead only using easy-to-trick people to cause the necessary chaos that is required to maintain balance in the world. However, that all changed when the realisation came that a new awakening of magic was going to come to Izona.
Ira saw this upcoming magical revival as a chance to show that she was more powerful than her sister who represented the side of light. After many petty feuds in the past that had been decided by one hero of light and one harbinger of darkness, Ira decided to up the ante, turning eight Izonians to the path of darkness. She quickly came to regret her decision when her pawns turned out to be threatening to the state of the whole world. Making amends with her sister, she now seeks to aid the heroes of the light to beat her harbingers of darkness so that they can’t bring an end to the world she and her sister created.