wait... Warrior of Light? When did we die?

That aside, a few characters didn't actually die. And by that I mean there was no fake out death associated with them. Minfillia never died but was sent to the first by Hydaelyn. She even tells you as such. Basically, she got caught up in Y'shtola's flow spell in order to reach Hydaelyn in the first place.

As for Sokoban, I don't remember him dying. He's stuck training to be the next Genbu but I don't recall him dying at any point in the story.

As for Zenos, his survival was foreshadowed since 2.2 during the leviathan storyline. He's less a living human being and rather a echo induced ghost possessing people.

I can see your point on Gaius, Nanamo and Gosetsu/Yotsuyu.

Though Louisoix is one that confuses me. When we meet him in 2.0, he was never alive. He's a ghost haunting the coil in order to keep intruders from dealing with Bahamut.