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Unfortunately you won't get anyone with magnetic powers until towards the end of the game. Its often a good idea to just concentrate on beating the story of Lego games and save the collecting for after you beat it and have access to all character abilities.
I've yet to even get Polaris, and I've finished the whole story and have done all the "side story" missions for up to having collected 150 bricks.
You're only a cheater in the eyes of someone who has yet to gain the knowledge to do what you can do.