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List of Injuries acquired in Ironicus' Dungeon
So, Gorion's Ward experiences varying amounts of memory loss, depending on the dialogue options the player chooses.
Imoen has that eye scar in her portrait now, and some people argue she manifests symptoms of PTSD.
Minsc is Crazier than ever. He's switched alignment from Neutral Good to Chaotic Good. He's picked up a vendetta against vampires somehow. His head injury is maybe worse than before.
I've got nothing for Jaheira. She seems distraught that her husband is dead but I can't think of any other specific way her time in the dungeon has impacted her off the top of my head.