My dream D&D campaign:
DM: J. R. R. Tolkien -He would make every encounter mean something, the sheer complexity and depth of the story would make it feel so real.
Warlord: Napoleon Bonaparte -Simply because he would flip his shit constantly, creating the most intense and crazy encounters by making us form some kind of bullshit formation and pulling it off like the pro he is.
Paladin: Joan of Arc -I can't think of anyone who would get into this role harder than her. She would live and breath her given religion, and smite motherfuckers left and right.
Bard: William Shakespeare -This guy would truly live up to the bard reputation. He would steal the show during every encounter, role-playing like a motherfucker. I would like to see him add commentary while the rest of the team is fighting.
Fighter: Miyamoto Musashi -I feel he would add a dynamic that is usually missing from most campaigns, actually reflecting on every action, every kill. And preforming them in the most bad-ass way possible of course.
Monk: Mahatma Gandhi -Sure, he might not participate in the fighting, but come on. Just think of how compelling of a character he would make, making you feel bad for killing that goblin.
Wizard: Sigmund Freud -Someone who would over-analyze everything while moving about the battlefeild doing who knows what. He would be the best kind of wizard player, the one where nobody can figure out what's going through his head.
Sorcerer: Benito Mussolini -I could depend on him to be cool and calculating, to think his action through like a boss until BAM! An action scene hits and he fucking looses it, blasting everyone in the room with glorious fire.
Rouge: John Dillinger -The guy I can depend on to be undependable, would he steal our shit? Yeah. Would he lie about it? Yes. Would he turn everyone against each-other? Very likely.
