Anissa is a 30+ yo cat girl who is a half-Viltrumite as the daughter of the Invincible universe character Anissa, a rurhless Viltrumite galaxy conqueror who eventually settled on earth and gave birth to a girl with a man she loved-Hamiliton. 

She lost her mother who fought in the final battle against Thragg and has been single ever since. As a half-Viltrumite, the Viltrumite DNA is so pure that almost completely overrides the human DNA. She could live for thousands of years and have superhuman flight, near vulnerability, superhuman senses, the ability to travel in galaxies by breathing in space and advanced regenerative abilities. 

Even though she was expected to embrace her viltrumite identity like many other half-breeds, Anissa fully embraced her humanity and refused to join the Viltrum empire under even Emperor Nolan and Emperor Mark Grayson the Invincible who turned Viltrum Empire into a force of good. 

She now wanders in the galaxy as a space traveler who loves endless journeys, seeking to find the prince she always dreams about.