It's interesting to have the chance to revisit a character and see them a little differently. Tiff didn't have a distinctive personality in Breakout. We saw a lot of her feelings, but not much about her nature. I mean, there's only so much character development I can fit into a story where that's not really the goal.
I decided in this case that was to my advantage. Since I had no real idea of what she was like in Breakout, I could "reboot" her without affecting that story. And I decided she's something of a mischief-maker. She decided to summon Fi, in spite of Kayla's embarrassment, and we'll see more of her mischievous side in future chapters. She's definitely lively in chapter 3...
She's the only one I did that to. There are others who we'll see fleshed out more than previous stories, but Tiff needed a role.