Bulging biceps is pretty much compulsory on a guy with a Krumper.
The leader skill that lets you double activate a guy seems hard to pass up. Especially with the way it works with group activations allowing to make a guy take 4 actions.
Not sure what to take for my combat champion. +1A on a charge is solid if a little dull and probably overkill. There's one to take a test not to be pinned when shot, that's probably very helpful when closing distance.