What to wear: You can dress in nicer clothes, like a button-up shirt and a blazer and slacks. You could also go the most obvious route and wear doctor gear, like a lab coat and a stethoscope. If you want to get really creative, though, bloody yourself up to the dead version of the character.
How to act: Shifty, maniacal, and downright evil. Don't forget that Archer has a British accent and constantly tortures Ali.