D&D One Shot

The PCs are shapechanging military organisation who must solve mystery of why they are still alive. They all remember dying but not all the details. Two of the characters have fallen in love. It might involve the Underdark.
There is an intimidating assassin who turns out to be the villain. they are part of same religion as a character.
The characters start at the scene of a murder. Partway through they encounter a new potential ally. If things are going nowhere someone discovers something unexpected in their pocket.
Afterwards there is a reward of a big favor.

The characters are emotional fighters who must bring down the evil overlord. One or more characters have cursed magic items.
It is at a fortified volcano which has a secret sacrificial chamber.
There are a pack of lizardfolk hunting a shipwreck. And an asylum seeks to survive a slaad apocalypse.
At some point a storm approaches.
As the adventure progresses a series of grim omens signal the arrival of a titan

The characters are powerful instructors at an academy who must rescue their mentors. One or more characters has an inquisitive mount.
It is at an enchanted village which is in the area of a hallow spell.
There are a pack of hungry dwarves seeking a sea hag. And an impulsive hero seeks to put on a fashion show.
At some point a rival turns up.
As the adventure progresses there are hints leading to a great betrayal

The characters are all undead who must destroy an eerie monster graveyard.
It is at a strange castle which is in an area affected by a mirage arcana.
There are a family of hostile travellers building something. And a lizardfolk shaman seeks to win a race of broomsticks.
At some point it starts to rain.
As the adventure progresses people start to gather for a wedding

The characters are all different monsters brought together by unusual circumstances who must recover a golden boat.
It is at a magnificent tree village which has a programmed illusion involving a black merfolk.
There are a few dwarves building a trap. And an alchemist is attempting to finish a hideous golem.
At some point something starts following the group.
As the adventure progresses people start dying in different ways