Fluttershy's Spiral is from her fear to become abusive in times of burnout towards her animals and friends.
From here we have:
Twilight: Falls too deep into studies and secludes herself as Equestria changes without her noticing time passing.
Pinkie: becoming the wrong person to have at a party that's too loud and crowded.
Rainbow dash: becoming too full of herself after becoming a Wonderbolt and eventually washing out with no one left.
And maybe even:
Spike: Greed induced biggness that ends up in him hurting those he loves.
Luna: becoming who she was before banishment again.
Celestia: getting tired of Equestria and abandoning it.
and more if any are suggested.
Music: https://www.youtube.com/watch?v=h58qk0hFQpI&list=RDh58qk0hFQpI&start_radio=1
