In the English-language version of the series, the character is known as Dan Dynamo, while his original Japanese name is Strong and he is called Bruno Retti in the Brazilian dub.

Publicly billed as the world's strongest man, he is introduced as a wrestler whose formidable reputation leads directly to his recruitment. He joins the team by the second episode, following an initial encounter with the main protagonist.

Throughout the series, he serves as a powerful combatant and a formidable ally, working alongside the central team to combat various threats.