Niko Bellic.
He's pretty handy with his fists & good in a fire fight.
He's a good(?) driver.
He'll never let you come to any harm, (even if you do get killed he'll just keep re-loading & try to save you again until successful).
He's polite and well mannered (except to bad guys, which is the best way for a bodyguard.
Best of all, whenever you're bored you just be able to phone him up and go bowling, drinking etc. Shit he'll probably do anything you ask no matter how menial, like pick up & return some library books or go to the shops for you, as long as you phone him up and make it sound like a mission.