Pro Tip: Main Character works best with Slayer>Guardian>Thief>Trickster>Healer>Elemental.
Lina: Theif>Trickster>Healer>Guardian>Elemental>Slayer.
Mari: Elemental>Healer>Trickster>Guardian>Thief>Slayer.
Kaz: Slayer>Elemental>Healer>Thief>Trickster>Guardian. Though some of those mid-game pick are preference on my part.
I think that if you're gonna force ashaka to be a glass cannon no matter what she wears, you should add a few more healing spell options, a more balanced item system, or at least some other way to make sure she doesn't get combo'ed to death by one enemy skill when she was at max health.
More like 1 day.