D&D One Shot

The PCs are all from the same village who must ransack a cursed ruins in the Shadowfell. The mood might be... tense
There is a feared village who betrays them partway through. they are the parent of a character.
The characters start waking at a shipwreck. At some point they encounter a storm. If things are going nowhere someone discovers something unexpected in their pocket.
It finishes with a reward of deeds to a city. Possible sequel... one or more characters start having dreams related to a monster from the adventure

The PCs are heroic lycanthropes who must break a curse at a legendary stone circle. It might involve a cult.
There is an infamous wizard who wants to do the same thing.
The characters start waking at a shipwreck. At some point they spot foes who are unaware of them. If things slow down a character learns something useful with an Arcana check.
At the end there is a reward of membership of an elite group.

The PCs are desperate warriors who must establish a base in an enchanted genie's palace. One or more characters has an inquisitive pet. It might involve adventurers.
There is a brash poet who comes with them.
The characters start at a disrupted funeral. Early on foes are waiting for them. If things get stuck they discover a magic item.
Afterwards there is a family gathering.

The PCs are troubled aasimars who must sell a magnificent tapestry. The mood might be... relaxed
There is a desperate warlock who offers them aid. they are the lover of a character.
The characters start in a chase scene. At some point foes try to ambush them. If things get stuck someone has/remembers a dream.
It finishes with a reward of a treasure map. Possible sequel... same adventure but everything more dangerous

The PCs are outstanding lycanthropes who must survive an undead apocalypse. It might involve bears.
There is a hilarious druid who betrays them partway through.
The characters start in a tavern brawl. Partway through they meet a rival group. If things slow down an animal messenger arrives.
At the end there is feasting in an inn. Possible sequel... an evil organisation's plans were ruined and try to take revenge on the characters