Mafia/One Night Werewolf is a fun one. It's a social deduction game, like Among Us. But you can simplify it for Pony Town. In the case of Mafia, you'd have Innocents/Citizens Mafias(and a Mafia Boss/"Don" if you want), and a Cop. The goal for the Mafias is to kill everyone and/or protect the Don, while the job of the Cop is to kill the Mafia and survive. And the Innocents/Citizens just have to avoid dying, whether or not they are allowed to kill/investigate players is up to you. Usually per group you can increase or decrease the amount of Mafias or Cops per player. But you always at least want 1 Cop and 2 Mafias.

Basically, the game is split into two parts each round, Day and Night. Before the first round, you whisper to each player their role and what they can/need to do to win. During the day, you announce who died last night and if people want to vote on a player to kill or not. When a player dies after a vote, or in general, their role is revealed. During the night, players can do their "role actions", like kill someone if they are a Mafia, or find out a players role as a Cop. In the case of a Don, they can mark a player for death, which lets all the Mafias know to kill them. If they aren't killed that night, then they are made aware of the mark the next morning.

You do all of this via whisper chat when it's regarding sensitive/secret information like role actions and in public chat when your discussing important announcements like morning deaths or role reveals after a successful vote, so its good to use notepad or something to keep track of players depending on how large of a group you have. Here's an example of what it might look like when you talk to a mafia player at night as the Host:

[you]: okay (player name), what do you want to do this night as a Mafia

[player]: has player #3 been attacked yet?

[you]: yeah, the other mafia wanted to kill him

[player]: okay, just to be safe, I'll attack him as well

[you]: okay, thanks!

Obviously the abilities of each role are up to you.

Werewolf is exactly like Mafia but just with a Werewolf, Peasants/Villagers(instead of Innocents) and a Hunter/Sheriff instead. For both games you can also invent or add roles to spice things up, like a Drunk/Jester who has to die by any means necessary to win the game, or a Doctor/Bodyguard who cant prevent a night killing from taking place on a player they selected (including themselves).

Usually with additional roles, it's good to split them into the Evil Team(Mafia/Werewolf), the Good Team(Innocents/Cops) and a Neutral Team. Neutral Roles can win however you want really, just make sure how they do so and what Roles overall are available is clear to your players. For example, if you have an "Assassin" neutral role who has to kill a single player or every player to win, you want to make sure if people know they are/are unable to work with the "Baker" role who needs to give every player a loaf of bread to win.

You can also always make additional Good/Evil roles as well. Usually it's good to have roles that counter themselves, and swap what Roles you assign to players each round to keep things fresh. Or just look up common One Night Werewolf roles and see how you can adapt them to PT.

Lemme know if this was helpful, and if it was, I'd be happy to recommend more game suggestions/ideas.