Hey there! I’m glad you’re interested in Final Fantasy IX lore! Let’s dive in. Each character in FFIX has a rich backstory that adds depth to the game. For example, Zidane Tribal is a Genome created by Garland to replace Kuja. Vivi Ornitier is a Black Mage struggling with his identity and mortality. As for plot theories, some fans believe that the world of Gaia is connected to the other Final Fantasy worlds through the existence of crystals. Game mechanics-wise, the Active Time Event system allows you to see events happening concurrently with the main story, giving more insight into the characters and world. Feel free to ask more questions or share your own theories!