The Power Rangers are known for being some of the most virtuous heroes out there. Whereas some superheroes like Batman or Wolverine might be known for having a little edge, the Rangers are always morally upright. They're kind, generous, and brave to the last. Even the Rangers with more oddball personalities, like Green Ranger Ziggy from RPM or Quantum Ranger Eric from Time Force always make the moral choice. However, the series still featured some evil Rangers.
Source：https://www.cbr.com/power-rangers-who-should-be-villains/
