Honestly? No one. He is someone who has been around for a very long time and has plans to 'fix' the world. After he does this, he wants to be forgotten. He is a means to an end, and nothing more. Like that guy from V for Vendetta. Too be perfectly honest, I think the Moon Eye Plan is a crock of shit. Tobi knew the different villages would never unite unless they had a big enough threat. After Akatsukl failed to do this, he plans to become this threat himself.
Or the Sage of 6 paths. One of those.