The Bhaalspawn are the Immortals from Highlander.It adds up. There's a bunch of them, but they keep killing each other and will keep doing so until there's only one, at which point he gets "the Prize", being godhood. All that's missing is the immortality unless decapitated, the inability to fight on holy ground, and the ability to pick other bhaalspawn out of a crowd with just intuition. Didn't stop me from naming Charname "Connor MacLeod" and saying, "There can be only one!" multiple times.
The Main Character from Baldur's Gate is Dexter Morgan.Let's see. Walking around and slaughtering criminals? Check. Traumatic childhood, including having watched the death of his own mother? Check. Close relationship to his half-sister? Check. Stuck between at least two competing love interests? Check. Dead foster father / mentor figure? Check. Mass-murdering evil half-brother, killed by him? Check. An evil being inside of him, taking possession of him from time to time? Check. So, the Main Character from Baldur's Gate is Dexter Morgan.
There were only 20 Bhaalspawn, total."The Lord of Murder shall perish, but in his doom he shall spawn a score of mortal progeny, chaos will be sown by their passage." Since score means twenty, this guess is assuming that it was used in the literal sense.
Only a few people in Candlekeep were killed by the dopplegangers, Not everyone.
"Boo" is a schizophrenia/split personality of Minsc.By all rights, Minsc should not be able to cast spells with Intelligence and Wisdom scores as low as his; indeed, there's a question of whether 2e would let him stay a ranger. However, given how sensible Boo's advice tends to be, there's a possibility that Minsc used to have some measure of sense...before his head wound. His head wound ended up slightly jarring the communication between the two spheres of his brain, giving him a case of what some psychologists (usually fringe, admittedly) would call a "bicameral mind". The spheres are communicating, all right, but the perceiving side isn't quite realizing where the reasoning side's messages are coming from, so it projects them to the most likely candidate. In this case, a certain hamster. When viewed in split personality terms, Minsc is a personality that's always forward, but manages to stay in some measure of contact with the other personality, to the point that the Boo personality can even use Minsc as a conduit for spells. Minsc still has the spell-casting requirements; they're just squirreled away in the Boo component.
Imoen’s Bhaal-essence is “different” because it attuned itself to that of the main character over their long association.“We're dead, aren't we? If I'm a Child of Bhaal, shouldn't I be... be gone, then? Just like Sarevok? Irenicus said I was different, but... I don't know. But I know I'll follow you wherever I can.” - Imoen Instead of her essence/taint being sucked into the black hole that is Bhaal when she dies, facilitating the typical Bhaalspawn disintegration, it stays in “orbit” around the main character until he either resurrects her or dies himself. This additionally serves as an explanation for why she’ll stay by Charname through thick and thin, even if he’s a mass murdering psychopath completely at odds with her own alignment.
Imoen is not your sister, she's your nieceShe is actually one of Bhaal's grandchildren/great-however-many-times-grandchild rather than the one of his straight-up kids. Considering that Bhaal apparently managed to produce a dragon Bhaalspawn and that dragon lived long enough to have a grown child of his own, and dragons have ridiculous lifespans, it seems apparent that he really got a headstart on that whole 'score of mortal progeny' deal. It's therefore not unreasonable to think that other early Bhaalspawn managed to get a few descendants of their own, too. So the reason why Imoen has so much less of Bhaal's 'essence' as compared to Charname and Sarevok is because it's been diluted through several generations. That, combined with her natural optimism and friendliness, means that it never would have even manifested without Irenicus' meddling. Gorion was probably unsure that a Bhaalspawn descendant would even be tied into the whole prophesy gig, and when Imoen didn't show any of the same signs of her heritage that Charname did, just assumed that she was off the hook. Hence his not bringing her along for their ill-fated Fleeing-the-Keep road trip, too.
Imoen's mother is Sheila from the D&D Animated SeriesThere are images of Hank and Bobby from the cartoon, apparently killed by Tiamat. Comparing Imoen and Sheila's character designs- they're both red-headed thieves with purple outfits.
The novels' Kill 'em All approach was deliberately done to avoid loose ends in Realmslore.While there are certainly plenty of things to choose from when it comes to disliking the novelization of the games, the fact nobody survives the trilogy was likely done intentionally from the beginning - Having anyone survive the whole trilogy would mean there would be at least one epic-level adventurer lurking around the Sword Coast, enough to call into question a lot of existing Realmslore and make for a few head-scratchers and wallbangers in the future. Also, having too much upheaval among powerful organizations would generate a lot of problems in the future, especially with firmly-entrenched groups like the Shadow Thieves. To avoid this, all the characters from the game were either not mentioned (most of the potential companions), down-written into lesser roles (Ellesime, Bodhi, Aran Linvail, Saemon Havarian), never became adventurers (Minsc), or died (Bodhi, Aran, the whole canon party including the protagonist), conveniently making the entire plot self-contained and having minimal impact on events beyond the times and places they occurred.