Trash

From the Tokyopop edition

Will Anderson is the nephew of a modern-day Al Capone. He lives in New York, goes to a ritzy private school, and dotes on his charming little cousin Kate. When he runs into a man and his pet penguin in Central Park, life turns complicated! Will is swept up into the "business" of the Trash Company, an odd-jobs outfit whose main work tends to involve stolen jewels and a whole lotta trouble!

Source: Anime News Network Encyclopedia