I have, like 10 characters I'm considering. Only a few have detailed backstories.
Zedabog
Druegar Gloomstalker, Urchin and Bounty Hunter. Came into Baldurs Gate through the sewers as a refugee from the Underdark. Grew up in the slums and made his coin hunting criminals in the places the authorities wouldn't go.
Boldgar
Druegar Spore Druid. Outlander of the Underdark. He has a wonderful relationship with the Myconids.
Gravelok
Half-Orc Former Captain. A member of a fleet of necromancer pirates. He commanded a crew of the undead and terrorized the Sword Coast until he was betrayed by his fellow captains and chose to jump overboard rather than be killed and join their crew. Losing everything, he washed up in Baldurs Gate, just in time to be abducted by Mindflayers.
Aelwyn
High Half-Elf Charlatan. She never had a strong relationship with her Elf side, instead choosing to make her way in the city by scams and plots. However, one day she scammed the wrong person and was confronted by thugs in an alley. A haunting voice called in her mind offering a deal. Power to defend herself in exchange for advancing their mysterious agenda. She agreed and became an Warlock of the Archfey.
Melphina
Asmodeus Tiefling Monk. An orphan left by parents on the steps of a hidden temple. She was raised by Acolytes and steeped in the Way of Shadows. She had ventured into Baldurs Gate to find her human parents, but was found herself by Mindflayers.
Ja'akas
Githyanki Bard, College of Swords. Never able to fit into the militaristic society of his crèche, he ran away at a young age and fell in with a troop of troubadours. He put his early training to good use, reenacting famous battles on stage with theatrical flourishes. Now in a makeshift band of abducted, he intends to annoy Lae'zel... or seduce her.
Figgins
Rock Gnome Cleric, Knowledge Domain. Some gnomes revere intelligence and become wizards or artificers. Figgins takes it to a whole different level, worshipping the very gods of knowledge.
Dorn
Dragornborn Noble and Sorcerer. The Dragonborn are descended from Dragons. It is known. But ones with stronger connections to their ancestors are held in higher regard. Such is Dorn. And his birthright brought raw magical power.
Aglwulf
Halfling Wild Magic Barbarian. No one knows where this feral creature originated. He was discovered by a regiment of soldiers patrolling a deep forest and lured into their camp with food. Somehow, the rough men and women found his crude ways endearing and made him their mascot. The surprise was theirs when he turned out to be useful in a fight, tearing through a party of highway robbers like a miniature pack of wolves.
Orsythe
Human Battlemaster Fighter. A veteran of many battles, he's a master of tactics, knowing just the right time and place to put an arrow to turn the momentum in his favor.