From my understanding of the D&D afterlife (I think this was from planescape) When someone dies they are sent either to the plane on which their god resides or the plane corresponding to their alignment, but while leafing through the 5e DMG I saw no plane corresponded to the Neutral alignment, so where would a neutral character go? If they favored no god, would Kelemvor charge them with guiding other souls? I have a player in my current game who is neutral and claimed his character does not believe in the gods, and I like the idea of him being cast into the dust as a larva or put in the wall of the faithless.
Put them up for auction.
Huh.
Actually, this could be a great adventure. Different pantheons & different outsiders bidding on unclaimed souls.
CG bidders think souls should be free and refuse to bid, or bid and let their purchases go. They don't have much cash, though. They do launch raids to release captive souls from the pens. They generally bid on good souls.
NG bidders don't usually attend, unless the mood strikes them. Again, not much of a purse. Purchases are expected to make a serious attempt to reside peacefully in their assigned realm, but not exactly chained down. They usually bid on good souls.
LG bidders find the proceedings distasteful but participate to redeem souls. They tend to buy souls that either follow their alignment (to keep them out of darker hands) or to try saving a seriously damned soul.
LN bidders obey the rules. They look for regular features, good posture, and compliance. They won't bid on souls that have attempted to escape.
N bidders are rare and most attend as factors for another bidder. They bid on specific lots.
CN bidders have a tendency to bid in prime numbers, cupcakes, or the letter "b". They pay in currency that may or may not be authentic, as well as cupcakes, fish loaves, and other bidders that are standing nearby.
LE bidders like to buy in large lots, but have discretionary funds to purchase unusual or exemplary items that are available. Auctioneers favor LE bidders, as they follow the rules, don't cause trouble, and have deep pockets.
NE bidders also work as factors for other parties, as well as making their own buys. They don't buy as much in bulk as LE bidders, tending to spend a lot on unusual souls. They enjoy buying unclaimed good souls. Like CE bidders, they're not above a bit of backstabbing during the auction either.
CE bidders are aggressive and disruptive, running up the price and then dropping out at the last minute, or just not showing up to pay. They don't like to pay a lot, much preferring to steal a wanted item later. They frequently launch raids to steal souls from the pens. They're also known to assassinate rival bidders to get the upper hand.