The Clown from the new season of American Horror Story doesn't exactly inspire calm and reason.
Kefka. Mostly because I want to see him speak to the UN.
I am a mighty wizard from magic lands
Baldrick(Take your pick) from Blackadder would inevitably screw things up somehow.
Lelouch vi Britania
Another terrible choice would be Zapp Brannigan.
Griffith. From Berserk.
Because after he "diffuses" the situation onto WW3, 4 and 5 simultaneously? A portal to Hell will open, demons will flood the world, and he'll end up ruling it.
How about "any Z-fighter outside of Gohan?"
Goku is just about as subtle as Brick, really. "Hi ancient god of destruction! Let's fight!" "Hi alien galactic-conquering, genocidal warlord, let's fight!" "Wait, wait, wait, crazy android thingy, I'm a little tired - fight my pre-teen son! Oh, and here's a magic bean to make you feel better first."
Honestly, it would be hilarious to see Mako Mankanshoku give it a try.
Satsuki would take over, problem solved.
I nominate Alucard.
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