So, with the stats I rolled I've been thinking about making Sariel, a half-elf warlock / paladin.
STORY
Sariel is the child of star-crossed lovers, a good human paladin who tried and failed to redeem the dark elf warlock he loved. Her mother sold the child of darkness and light to the Dark Powers for personal gain. But even though her soul belongs to the Shadowfell, Sariel will spend her life doing as much good with her powers before being dragged off into the darkness.
Probably not going to be too brooding/emo with Sariel. This has edgelord written all over it, but I would play her as good-natured, although pissed off about the fate her father sold her into. While she is prone to violent outbursts, she will mostly be trying to stack up the number of ticks in the Good column with the hope that she can balance the evil that will come from her mother's betrayl. The story is a redemption arc but not from her own deeds, so I feel I will be free to play her as less edgy/brooding and mostly good, but with a dark side.
Sariel believes her father is dead but her mother is alive.
PARTY CONNECTIONS
I'm assuming (because we're playing an adventure path) that we will mostly be a good party. If it's not shaping up that way, I will try to change the concept to match. If it does shape up to be a mostly good party, an easy connection would be that one or more of the characters in the party was responsible for bringing her back from the darkness or helps keep her in the light. Maybe HypCo's mystic uses his mental powers to soothe Sariel's troubled mind in troubling times?
MECHANICS (awaiting DM approval)
If it meets with your approval, Sclasclemski, I'd start with the Hexblade patron from Xanathar's guide. Sariel will therefore be able to use Charisma as her attack and casting stat, which makes up for her otherwise weak stats.
I'll make sure I take at least a 13 in strength so I can multiclass in Paladin shortly after, eventually going with the Oath of Vengence to avenge her fallen father. Not sure how the levelling will go. It will probably depends on how the story goes, but at the moment I feel like it will start on the light side with lots of Paladin and then get darker with lots of warlock as she gets into the higher levels.
A being of light descending into darkness. Can she redeem herself?