I think Astarion has one of the most engaging stories. His vampire nature gives him a dark allure. His backstory of being tortured by Cazador and his attempts to gain freedom while also dealing with his newfound vampiric powers makes for a really gripping narrative. It's full of twists and turns, and his character development throughout the game is fascinating.
I think it's Lae'zel. Her story is centered around her Githyanki heritage and her strict military upbringing. She has very strong beliefs about her race's superiority at first, but as she travels with the group, she begins to question some of those long - held ideas. It's really interesting to see her grow and change as she experiences different cultures and situations outside of what she knew in her homeland.
For me, it's Lae'zel. Her unwavering loyalty to the Githyanki cause at first, which then gets shaken as she experiences different things in the world, is really fascinating. She has a lot of pride in her race but also starts to question some of their ways, and this internal conflict makes her story stand out.
The Half - Elves. They are a blend of two races, and this often leads to a sense of not fully belonging anywhere. In the story of Baldur's Gate 3, this can be explored in many ways. For example, they might have to choose between the cultures of their human and elven sides, or they could be shunned by both. This inner conflict and the search for identity can create a very engaging story as you progress through the game.
The Warlock. Warlocks have made a pact with some otherworldly being, and this pact is at the core of their story. In Baldur's Gate 3, this can lead to some really dark and mysterious storylines. Their powers are unique and often come with a price, which can create a lot of tension and drama as the story unfolds.
In my opinion, Lae'zel has a very compelling story. She is a Githyanki warrior, and her story is full of her people's culture, honor, and the struggle against Vlaakith. Her loyalty to her race and her slow realization that things might not be as they seem in Githyanki society is really interesting. It's also cool to see her interact with other characters from different backgrounds and how she adapts or clashes with them.
One of the best companion stories is Astarion's. His journey from a vampire spawn with a dark past to potentially finding a new path is really engaging. He has complex relationships with other characters and his personal growth throughout the game is fascinating.
Shadowheart's story is also top - notch. Her past as a Sharran, her hidden memories, and her gradual discovery of her true self as she travels with the party are really engaging. There are moral choices along the way that shape her character and her relationship with the other companions and the player.
Shadowheart's story is very captivating as well. She starts as a somewhat mysterious cleric with secrets of her own. Her loyalty to her goddess is tested throughout the game. As she uncovers the truth about her past and her beliefs, she undergoes a significant transformation. Her relationship with the other companions and the main character also evolves in interesting ways.
I think Wyll has a very engaging story. He made a pact with a devil, and his struggle to break free from that pact while still trying to do good in the world is full of moral dilemmas. His origin story shows how he got into this situation and his continuous fight against his own dark side.
For me, it's Gale. His story involves his relationship with magic and a dangerous artifact he has. He's constantly grappling with the consequences of his past actions regarding this powerful object, and his journey to either redeem himself or face the consequences is fascinating.