In the first mission I liked that the Yakuza B (the one who tried to rape Kishimoto) died. The other guys didn't do anything too bad.
In the second mission, I liked when the bikers died (specially the fat one that treathened Kei), they were violent without a reason, uncoperative and all they did was being a pain (Tetsuo tried to rape Kishimoto...that girl surely gets into trouble)
In the third mission, the monk was a total pain, if he hadn't been there, maybe the other gantzer would have used the suit and be helpful from the beginning.
In the fifth mission most of the people who died had little participation (most died by leaving the area because no one told them not to do that) so I can't blame them.
In the sixth/seventh/eight missions I liked that the rapers died (come on, who doesn't like a disgusting criminal die in fiction once in a while?)