Booster hails from the distant future (the 31st century to be precise) and was a complete loser. He worked at a museum for superheroes after his failed sports career. He did have an idea though, he stole a superhero costume, a museum robot named Skeets and a time machine to get rich by being a superhero in the 21st century. Think of an actor trying to make it in the business. His voice should always have a bit of showmanship. Think of something like Lewis Pullman or Glenn Powell for his voice.