From ROI Wiki

Sarah is a Benoi lifeform of the xenopoid variety and one of their scientists. She initially comes to Earth, curious about the human race, but later becomes interested in Mike Clayton and, in order to stay close to him and observe all he does, she replaces the AI on the Sergenious with herself. She later on grows to like Mike so much that she falls in love with him. Sarah is also the strongest of all the Benoi, and the most powerful, making her a target of the less savory members of the Benoi who wish to bond with her and use her powers to take over the multiverse. Her biggest rival, and perpetual thorn in the side, is a fellow Benoi by the name of Zoahn.