Sesame Street is introducing a new Muppet to its cast, and she is unlike any Muppet they have had before. Her name is Julia, and she has autism. The character was introduced online in 2015, but will now become a regular on the television show. Rachel Rosner, the director of education and support services at Rochester-based Autism Up, said introducing a character with autism is a huge step forward for the show — and for raising awareness. “As a parent of two kids with autism, I’m thrilled that there’s finally a character with autism on Sesame Street,” Rosner said.