>Final boss after the Curator, when you decide the fate of the painting by playing as Verso or Maelle and fighting the other. Yes that's right, the tutorial fight with Maelle at the beginning of the game is also the final duel you have in a sense because Gustave/Verso is the same kind of idealised oniichan archetype. And all this is even possible because Verso has found out he can interact with the vestige of the real Verso's soul, who is the actual reason why the Painting is sustained and the cause of Alina and Renoir fighting over whether the painting should stay/go. Verso wants Alicia to leave and start healing from grief, and Alicia wants to stay in a world where her face and throat aren't mangled, to keep the painting alive and to be with onii-chan. And Verso knows after their fight, Alicia was bullshitting to her dad about being able to quit the painting any time she likes
>Choose to play as the gruff untrustworthy traitor and the Painting ends, all your friends forgive or at least extend understanding to you except Lune who just kind of sulks outside the room. But the painter family finally mends bridges, and even with her scars Alicia has the chance to move on and make a life of her own with the memory of her Painting friends cheering her on
>Choose to play as the idealistic imouto with anime white hair and a last minute asspull powerup that literally lets her do more than 9999 damage and who just led an army of resurrected expedition members to glorious victory that is constantly pleading with said traitor to stand down and talk things through during the fight, and Verso dies first begging Alicia to end the painting for her own sake, and then begging for death because the last thing he as a vestige of the real Verso wants is for his little sister to waste her life away in the painting forever as a living lie tying her to it. But instead, Alicia is so mindbroken by lack of onii-chan that she resets the painting's reality so Verso as Gustav gets to live a full life. Verso/Gustav senses this is fucking wrong but sees a vision of Alicia's mangled eyes from sustaining the painting, and ultimately just goes along with it in utter defeat
Absolute kino. This game made the point FFTA tried to a thousand times better than the original.