I submit
Imti, the Shadar-Kai Twilight Cleric. Her background is an Astral Drifter wandering the Astral Sea in search of forgotten memories, but ironically she forgot her purpose and has spent nearly a century in seclusion and self-reflection wandering around before she met the party (took Hermit traits for personality/ideal/bond and Acolyte for flaw).

I rolled Hecate as her divine contact, but may I reflavor that to have been the Raven Queen returning Imti to the path?
With chainmail and shield, she can attempt to serve as a tank; at the very least tie up melee opponents while everyone else blasts from range. Her ability to Misty Step with resistance to all damage for one turn can also help in tanking. Selected a warhammer and spear from starting equipment, and spent most of the gold on two diamonds for Revivify. I've also added
Mending as a cantrip, so should I run out of spell slots to heal This One, at least I'll be able to offer a chance to spend Hit Dice to heal.
For the magic item, I'd like a
Broom of Flying.