Examples of 'good' warlords in the Warlord Era of China?

So, I was watching a Extra History episode about Sun Yat Sen and the narrator said 'while a few warlords tried to guard constitutionalism, most ruled through naked exploitation'. I'll freely admit, I'm not very familiar with China's Warlord Era, so I don't know who the warlords are.

Were there any examples of 'good' warlords? As in, warlords who genuinely took care of the people under their reign and/or allowed some democracy in their domains? Also, out of all of the warlords in China, who was the worst? Worst as in people who died under their reign, their level of brutality, etc?
 
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