He was voiced by Kazuhiro Yamaji.
The Leo Imagin was sent by Kai to kill Ryotaro Nogami, having his three Leo Soldiers to battle Momotaros, Urataros, and Kintaros in the Time Station while he deals with Ryotaro. But Yuto Sakurai manages to fight off the Imagin as Momotaros, Urataros, and Kintaros use their versions of Den-O's finishers to destroy his Leo Soldiers.
When Den-O Sword Form appears, the Leo Imagin travels back in time through Kai as Den-O pursues him. Before they could begin fighting, Momotaros loses sync with Den-O, causing Ryotaro to assume Liner Form instead to fight the Leo Imagin. Leo was using destroyed by the DenKamen Sword's RyuGun Mode.