D&D One Shot

The PCs are insane gnomes who must survive an attack by giant. It might involve bullywugs.
There is an infamous healer who has important information for them.
The characters start at a burning tavern. Partway through an ally turns out to be an enemy. If things slow down a rival turns up.
Afterwards there is a family gathering.

The PCs are infamous members of a ruling family who must defend a haunted glacier. Two of the characters have a bet about the evening. The mood might be... deadly serious
There is a drunk ogre who betrays them partway through. they are the drinking companion of a character.
The characters start at a disrupted funeral. Early on they encounter a planar portal. If things slow down a pet escapes.
Afterwards there is one character narrating about all of the others.

The characters are all halflings that share a flying broomstick who must bring down the evil overlord.
It is at a haunted theater which has a programmed illusion involving a gold antelope.
There are a group of starving dwarves digging a hole. And a blessed general wants to sail a ship to a dangerous location.
At some point a friendly animal leads them in the right direction.
As the adventure progresses there is a series of murders

The PCs are rebel goblins who must collect a bounty on a venerable bugbear chief. Two of the characters are former friends. It might involve gnomes.
There is a wise noble who betrays them partway through. they are the close relations of a character.
The characters start at a party that is disturbed. Early on they encounter a new potential ally. If things slow down a friendly animal leads them in the right direction.
At the end there is a carnival. Possible sequel... one or more characters start having dreams related to a NPC from the adventure

The PCs are despised witch hunters who must complete a ritual in an enchanted asylum. Two of the characters are friendly rivals. It might involve summer.
There is an old necromancer who wants to do the same thing.
The characters start outside some ruins. Partway through there is a chase scene. If things get stuck something goes missing.
At the end there is a reward of the satisfaction of a job well done.