I messed up and didn't recruit the cats and I don't know how to recruit the doll, have I essentially screwed myself out of the pacifist ending? I REALLY don't want to have to restart from the beginning because I was dumb.
From the main menu, you're able to choose which chapter to start from based on your save file. So, if your save is currently on 2-3, you can choose to replay 2-1, or 2-2, or even 1-1 if you want to. Replaying 2-1 will help you befriend Haru and Liz if you missed them, and replaying 2-2... well, I'll keep it brief to avoid spoilers, but replaying 2-2 is
necessary for befriending Mukuro. You cannot befriend her in a single runthrough of 2-2.
But if you do mess up True Mercy, don't sweat it. Just accept the ending you get, and start a new file. So long as you reach max friendship with the demons you
do befriend, repeat playthroughs are a breeze.