Bad Boss: With a side of Even Evil Has Standards, though. He executes his original gunner for "accidentally" destroying the Grissom, though seems rather disgusted that the gunner showed no remorse in blowing up a defenceless science vessel.
Disney Villain Death: A variation, as we do see his body explode into a fireball when he lands in a lava pit.
Genre Savvy: He's smart enough to see there's something fishy about Kirk's initial bluff, and later is immediately able to recognize the self-destruct countdown for what it is.
Leeroy Jenkins: He starts a firefight against a battle cruiser-level starship that outguns him 10-to-1 (granted, he thought he had the element of surprise), then when that doesn't work out he sends a boarding party of less than 10 men against a ship with a normal crew compliment of a few hundred. He only gets as far as he does because the Enterprise was battle-damaged and operating with a crew of five (which he had no way of knowing at the time).
Taking You with Me: Tries to drag Kirk down into a firey chasm, and before that he seemed quite happy with the possibility of dying with the Genesis Planet if Kirk wouldn't give him the info he wanted.
Admiral Morrow (Robert Hooks)
Obstructive Bureaucrat: Granted, the situation around the Genesis Planet was undoubtedly a very difficult one from a political standpoint, but he point-blank refuses to help Kirk out in any way after being asked to help retrieve Spock's body. On the other hand, he at least seems genuinely concerned for Kirk, rather than just being obstructive for the sake of it.
Torg (Stephen Liska)
Beleaguered Assistant: Nearly gets vaporized by Kruge in the aftermath of the Bird-of-Prey's first gunner getting blown to shreds, after Torg attempts to reveal the existence of David, Saavik and Spock on the Genesis Planet.
Fatal Flaw: If only he understood Arabic numbers, he might have been able to call for a beam-out in time. Unless he was just Too Dumb to Live...
Maltz (John Larroquette)
Death Seeker: The film leaves it ambiguous as to whether he actually wants to die after the rest of his crew is killed, or whether he's just annoyed that Kirk is screwing with him. The novelization of the film makes it more explicit, and he commits suicide before the captured ship reaches Vulcan.
Sole Survivor: The only surviving member of the Bird-of-Prey crew, most of whom get blown up with the Enterprise, and the remainder of whom are killed down on the Genesis Planet.
Taking You with Me: Refuses to help the Enterprise crew fly the captured Bird-of-Prey to safety, likely happy in the knowledge that they'll all die when the Genesis Planet goes boom. Fortunately, Scotty and Sulu work out how to fly it anyway.