1.The Carnival. That's just my favorite place in the game in terms of sheer atmosphere.
It's this weird mix of melancholy and cheerfulness, as you listen to that music and play and watch as see the robots shooting balloons and confetti in the air. It's cheerful in a way but you can tell that the park is kind of... empty? Like, all of the celebrations are almost hollow, or something.
It's one of the few places I've ever been in a game where I'll regularly walk instead of constantly sprinting about because the atmosphere is just so perfect. It also has one of the only times I've ever avoided what looked to be a unique and interesting boss fight just because it seemed genuinely wrong to kill the boss. Not even saving and reloading, just... never ever killing the poor, poor party tank.
(I confess, I eventually ended up killing it to get the unit data for the quest, but I did that post-route E, so...)
2. Pascal's village during A2's gameplay.
Watching all those innocent machines getting butchered was the angriest a game has ever made me through story alone.
I just wanted to track down whatever bastard did that to Pascal's people, put on my crocs, and unleash a Caim level of murder on every bastard that got in my way.
And then the scene with the children and Best Robot's reaction to them managed to drain that anger away into numbness.
Also, props for the fact that it really caught me off guard, because I had gathered the materials necessary to complete two sidequests and accidentally triggered the attack. I didn't think the game would give me that little leeway when it came to completing the sidequests before the village was destroyed.
Still, that shocked me more than angered me, so that was a good twist.
3. Ending E
I'll keep this brief: It was amazing, I teared up, and Weight of the World is pretty much the only song I'll play on the radio in FFXV
4. The whole... Become As Gods segment.
That was... freaky. When I finally got to the point that those guys where all those machines were stabbing those prone machines in the background, I actually made it a point to shoot all those machines getting stabbed as a mercy kill.
I didn't even stop to think that there probably wouldn't be any gameplay repercussions, that the game wouldn't recognize what I was doing.
Any game that makes me forget myself like that gets major props in my book.
6. 6O.
She's adorable. 'nuff said.