Shawn "Pit" Pitman, feature lead for the Going Rogue Alignment system talks about just how much work went into the latest City of Heroes expansion

Who knew changing your morality could be this much work! In the latest developer blog from Shawn "Pit" Pitman, he discusses some of the behind-the-scenes concepts that went into making City of Heroes' Going Rogue expansion what it is today. Specifically, Pitman touches on the thought process that lead the team to creating the "Hero's shadow," the Vigilante, and the "Villain's less ambitious cousin," the Rogue, two moral categories that almost every writer (comic book or not) struggles with on a daily basis.

From a character development point of view, it's easy as pie to create the true Paragon of Justice and the absolutely evil Villain, but where things start getting difficult (and interesting!) is when you make the move to more greyer waters of morality. Pitman and the team over at Paragon Studios really understood this, and so they really wanted to create the journey from good to evil, or vice versa, as well as why they didn't want to give players that "Im naow teh evilz" (his words, not mine) button.

Either way, it's a great developer post and gives some keen insight into how the team had to re-do massive portions of City of Heroes to incorporate the Rogue and Vigilante moralities, including preventing NPCs from killing everyone on sight, editing six year's worth of missions, merging markets and more.