I really like every character in this manga. They all seem to be good people that are just trying to survive but still following the beliefs they had. The old man was just lonely albeit with some issues. The man in the suit was following his believe that all men who held guns should die which included him which is why he succumbed to the disease. And the people in the bus all forfeited their life for the chance that one of them may survive. Truly a very tame and idyllic apocalypse.