A strong flak build for story could include high - damage flak guns with enhanced accuracy mods. Also, prioritize armor that can withstand enemy attacks well. For example, the [specific flak gun model] with a scope for better aiming and a reinforced chest plate.
One of the great companion stories is that of Astarion. His journey from being a vampire spawn under Cazador's control to seeking freedom and redemption is really engaging. His past of abuse and his attempts to break free while also dealing with his newfound feelings towards the player character make for a complex and interesting story.
A classic and effective party composition could be a tank, a healer, a ranged damage dealer, and a melee damage dealer. For example, a Fighter as the tank to soak up damage, a Cleric for healing, a Ranger for ranged attacks, and a Rogue for melee damage and sneaking around. This allows for a balanced approach in combat and different skills to be utilized during the story quests.
Shadowheart also has an amazing story. She's a cleric with a mysterious past tied to her goddess. As you progress through the game, you get to uncover her true self, her doubts, and her growth. Her story is filled with moral dilemmas and self - discovery, which makes it really interesting.
There's a fanfic called 'In the Clutches of Raphael' that is quite engaging. It focuses on the relationship between the main character and Raphael. The author does an excellent job of building tension and exploring the power dynamics between them, making it a must - read for BG3 Raphael fans.
Wyll is an interesting companion. He made a pact with a devil, Mizora, in order to gain power to be a hero. His story is all about his attempts to redeem himself and break free from the devil's hold. His relationship with the other companions and his decisions based on his moral code are key parts of his story. Karlach is another great companion. She has a heart of gold despite being a tiefling. She escaped from the hells but is haunted by her past there and her time with Zariel. Her story is one of survival and finding a place in the world.
In my opinion, the Githyanki is a great race for the BG3 story. They have a rich and complex backstory, which is deeply intertwined with the game's lore. Their culture, values, and the whole concept of their society add a lot of depth to the game's narrative.
A party with a Cleric, a Rogue, and a Wizard can be great for the story in BG3. The Cleric can heal and provide support, the Rogue for sneaking and lockpicking, and the Wizard for powerful magic to deal with various challenges in the story.
Lae'zel has a fascinating story too. Being a Githyanki warrior, her loyalty to her people, her beliefs about the creche and her experiences that make her question and grow throughout the game add depth to her story.
In BG3, Lae'zel has an amazing character story. Her journey from a loyal Githyanki warrior to one who questions her people's ways is captivating. She has to deal with her loyalty to Vlaakith while also seeing the different ways of the world outside her own culture.