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I feel like this is hard to explain but I had a pretty big one after actually getting around to writing these characters I've had floating around for years. For example: when Tavi was concieved I thought of him as basically a humorless angsty boi who was really mean and rude to everyone but when I started writing him this time around, I discovered he's very sarcastic and thinks he's hilarious. He's still a huge dick, but in a very different way.