I'd probably like to be Ganondorf from Zelda or Conker The Squirrel.
Ganondorf because I wouldn't be dumb about how I did things for conquest and I'd have an evil kingdom on evil grounds and look evil and awesome, and hopefully not get my arse pwnt by a kid in green. XD;;
Conker because I love his personality in a joking way. He's funny, materialistic, rude, and king of all the land. XD He spends his time getting tanked and digging around for a buck or 20 and on top of everything else, he wields two AK-47's with a fat cigar in his mouth.
Other than that I'd probably say Romani or Cremia from Majora's Mask. This will sound a bit cynical so sue me, but having a ranch, watching your last moments with your family, It's alright. Or as an alternative, having a young child help you and keep you alive, that'd be great too. <;D
XD I figured I should have added some females, since it must be weird for a girl saying she'd be a boy character.