Bob Jennings is immortal. His abilities are such:
He is completely immune to bodily harm, i.e. bullets bounce off of him, he can't get killed by anything.
He does not have to breathe or eat.
He is immune to all diseases.
He does not age.
There is no way to kill him, i.e. he will necessarily live forever unless he chooses to die (irrelevant how that happens).
He also has super strength. He is approx. 2-3x stronger than the average human, meaning that he can beat almost anyone in a fistfight, but can still be restrained by a pair of handcuffs.
He has one goal:
Take over the world!
There are a few restrictions on how he will do this:
Maximum 15% of total human life killed during his conquest since he still wants a large population to rule over.
The internet and communications infrastructure must remain intact, in case he wants to while away the hours looking at cat gifs on Facebook.
BONUS POINTS if he...
Can pull off his plan within 15-20 years. Although time is meaningless to him, he wants to ascend as soon as possible (those cat gifs won't watch themselves!).
He wants society to be pretty much the same as before (i.e. not a communist totalitarian dictatorship like this. He wants the general population to be fairly content, although rebels and the like must obviously perish.
The amount of fighting should be minimized as much as possible.
If it is impossible to conquer the world so quickly, then an explanation of why not will suffice!
Thanks and have a good day!
(NOTE: I probably screwed up on the tags, if you have any suggestions, let me know!)