Final answer:
Hayden Christensen sued Dannon yogurt for using his image without permission in their Ron Raider promotion.
Step-by-step explanation:
The person who sued the Dannon yogurt company for using a character named Ron Raider for promotion was Hayden Christensen.
Hayden Christensen, an actor known for his role as Anakin Skywalker in the Star Wars movies, sued Dannon for using his likeness without permission. Dannon had used a computer-generated image of Christensen's head on the body of Ron Raider in advertisements for its Oikos yogurt.
Christensen claimed that his image was used without his consent and that it created the false impression that he endorsed the product. The case was settled out of court, with Dannon agreeing to remove the advertisements featuring Christensen's likeness.