That sounds like a fantastic idea! An RPG based on the Fediverse could be a creative and entertaining way to introduce people to this decentralized social network. I love the character concepts you've come up with, especially Pixela, the mage who can manipulate images and illusions. As for enemies, perhaps you could include malicious trolls or spam bots as adversaries that the player must defeat. And quests could involve tasks like rescuing silenced accounts or uncovering hidden instances. Game mechanics-wise, you could incorporate zapping as a form of in-game currency or power-ups. It definitely has potential for fun and educational gameplay!