Michael Eisner, who presumably never had any intention of adding superheroes to the mix of animated characters at Disney when he was the company's CEO, is now a leading member of a buyout group that is taking over Topps Co. Inc. The company is known for its Bazooka bubble gum and trading cards that feature the Marvel super-hero family and sports figures. Topps on Tuesday said that it had accepted a $385.4-million offer from the group, which includes Eisner's Tornante Co and Chicago-based Madison Dearborn Partners, a private equity firm.