LogFAQs > #928982879

I did true pacifist on my first playthrough, no guide required

your "tutorial character" basically tells you that you don't have to kill anyone, and one of the main menu options is MERCY, so it's not a surprise at all

figuring out how to spare enemies is also very easy, because you can simply "check" an enemy (which is like scan from FF I guess) and the game will give you a pretty obvious hint about how to spare that enemy (through a different option under the "ACT" menu).

don't let anyone like smartmuffin try to convince you that the game "moralizes" if you don't do it right the first time, because it's pretty obvious

edit; I originally said "spare" instead of "mercy" above