whats the requirement for each ending
Think it might be in the walkthrough, unsure. From what I remember though, they're:
True Mercy, spare and raise affection of EVERYONE to 100
Mercy, unsure if this is actually in the game to be honest but i'd assume so
Neutral, spare most kill a few. Variations of neutral for killing more, I think the break points are... each five levels? Somewhere around there, at any rate.
Genocide, kill everyone and spare no one. You can't even get this ending anymore since the genocide final boss is impossible without cheating.
Pardon, kill everyone but when offered the final choice of whether or not to take the final boss' hand, take it. You can't even get this ending anymore since the genocide final boss is impossible without cheating.