The Sims 3
Percy is clearly absent from The Sims 3, since it begins two generations before his birth.
The Sims
Since not even Percy's mother is alive in The Sims, Percy still has yet to appear.
The Sims 2
Percy's only appearance in The Sims Series is in The Sims 2. He lives comfortably in Pleasantview with his mother, sister, and uncle. He, like his sister, is generally care-free, and has yet to learn of the many secrets that form in the seemingly united community. Other than the people he lives with, he's very close with his Aunt Elise and grandmother, Caridad. Nobody, not even his mother, is positive of his or his sister's father, since his mother was known for her promiscuity and undeniable charm.
Percy's appearance is very interesting. Other than his skin tone and select facial features, he bears many characteristics that aren't found in the Ionello Family, hinting about some of his father's traits. He has bright blue eyes, and light brown hair, contradictory to his maternal's side of the family's brown eyes and black hair.