Vindictive I can speak on, but not Combat Monster.
I have a character that has vindictive for most interactions the character is joking around and is a fairly likeable personality. However there is sort of an underlying instability to the jokes and laughter. There's a 'do not cross line' that I make clear when the character's temper flares. "Minor things" such as a joke that the character feels is actually an insult might get an outburst and a threat. "Moderate things" like actual insults, spitting on, hitting but doing no damage would result in a battering and maybe a few targeted kicks while the person is down. "Serious things," hurting a friend, doing damage to self or property, betrayal...well then its time to kill someone.
That said, vindictive is only a Composure 2 roll so you can have it and still be pretty much in control but to quote Walter Scott Williams, "Perfect control is
sought, but there are accidents-impacts, a flurry of fists and elbows-and someone crawls out of the zone, whimpering through a bloodstreaked hand, unnoticed by the pack. "