Dr. Doom - Savior of Earth
Dr. Doom in a lot of way reminds me of Lex Luthor. Wealthy, Intelligent, independent, and from time to time sides with Heroes when there is a greater threat.
Plus there have been indications in the comics that eventually the world will face a massive threat, and unless Dr. Doom rules and leads the charge, the world will be loss.
In addition, in some stories when he has taken over, things are seemingly a paradise.
And despite him being a "Villain", he's certainly no fan of Villains either and has frequently clashed with them on numerous occasions. He bows to no one.
He comes across very much like a Marvel universe "Chosen one" but not the "Chosen one" that anyone would expect or want. But it makes sense. Insanely wealthy, incredibly intelligent, a ruler, powerfully magical, a master of technology, while having skill in Martial Arts as well from his travels. He seems to posses some Psionic abilities as well.
And on top of that, he's Hosted some pretty potent powers including The Power Cosmic, The Phoenix force, and those of the Beyonder.
I propose a storyline where, after a major instance with prominent supervillains causing mass death and destruction, including an entire Latverian Delegation, Doom decides enough is enough. He's decided that the Superhero/Supervillain dichotomy must end. Too long has the Earth, and his people, been subjected to attacks from villains, terrorists, aliens, monsters, universal threats, mystical threats, and multiversal threats, and Dr. Doom now intends to be the savior it's been prophesied that he'd be. His first step is to acquire power, and titles. One's that will make him invincible.