Iruka - sensei could be Naruto's mentor in the star world. He could be the one who discovered Naruto's talent and guided him on his journey to stardom. Iruka - sensei would offer advice on how to handle the pressures of being a star, just like he taught Naruto about being a ninja in the original series.
Sakura could be Naruto's personal physician or his stylist. Given her intelligence and her skills in the original story, she could play an important role in keeping Naruto in top shape for his shows or making him look his best. She would be the one to patch him up if he gets injured during a stunt or a performance.