Phineas is a 3-star celebrity if The Sims 3: Late Night is installed. Despite being a celebrity, he only knows Sarah Holden, Joaquin Dorsey, Josie Crane and his boss. He has two points in both Athletic and Writing skills.
He could be a reference to John Galliano.
Phineas Bledsoe is mentioned in a table and two chairs' object descriptions from The Sims 4: Movie Hangout Stuff.