Tools of the Trade
The ability to unflinchingly throw down the law book on a whimpering civilian and then go make two young lovers cry tears of joy at a wedding ceremony. Yeah, it's an emotional roller coaster.
A snazzy gavel. Maybe add some glitter and feathers for a little extra flair.
More than one comfy black robe because, come on, you know you're gonna spill your lunch from time to time and no one is taking a judge with ketchup on his sleeve seriously.