Converting roles are those that have the ability to convert players to their own team. These roles are enemies of the Village (excluding the Cupid), and must be killed for a Village win. In normal games Converting roles replace Solo Killers.
You must convert everyone that can be converted (Every villager (except Cursed) and solo voting roles). That means that eliminating all Werewolves is a requirement. The only exception is Cupid, your couple just has to be alive until the very end.
Currently, there are 3 Converting Roles in-game.
Sect Leader is a role that can convert players to their team. Everyone in the sect will commit suicide if the Sect Leader dies (The only exception is if the Sect Leader suicides, the sect members will return to their original teams).
On the first night, Cupid must choose 2 people to be a Love Couple. The Love Couple can work with Cupid to win, since they share the same win condition. Your chosen lovers have to be the last two people alive (Having Cupid is alive is an option).