AIDS has come to attack cancer.
As the embodiment of human goodness, Qianhu can be said to be the only remaining conscience of Da Ming. Merely by assisting the elderly across the road, he has helped quite a few, and also subdued several scammers, pressing their heads down to make them mend their ways. All in all, Qianhu's existence is definitely a peculiar flower in Da Ming, and a rather resilient "kind" peculiarity at that.
If replaced by an ordinary Madonna, surviving in Shura City would be utterly impossible – after all, one can't truly search for chocolate in a pile of shit, unless they're willing to taste it firsthand.
However, if you were to replace with someone whose will is not strong, they're likely to be quickly assimilated by or crushed by the environment of Shura City. Because the conditions here aren't just harsh, compared to Shura City, the kindergarten teaching kids not to hoard food, Gotham City seems like heaven on earth.
