Character Rewrite: Princess Elise. When Elise was a young child, to prevent an apocalyptic disaster, her father sealed half of Solaris; Iblis, inside of her. Elise was aware of her duty to the family and her people, willingly becoming it's vessel. Before her father died of his injuries, he told her to stomp on her anger to prevent the flames from overtaking her. She must not get angry, no matter what happens.
Because of her youth, a lot of advisors in her kingdom had taken power from her or often tried to manipulate her into decisions she didn't want to make. She was unable to stand up for herself or fight back, and lacking control made her angry. She would set things on fire around her by accident when frustrated. To prevent this, she often retreated into her mind, dissociating, masking her negative emotions. She knew it wasn't the best coping mechanism.
So, to keep her mind as peaceful as possible, she'd practice meditation, drink warm tea, and go to the spa. Her people and advisors often saw her as spoiled or weak, not knowing that if she let her stress consume her, everyone around her could die. She was actively protecting them from a great disaster, and they didn't even know it.
Then, when she was kidnapped by Eggman, in came Sonic, who whisked her away from everything- the stress of her duties as princess, as well as the vessel. She saw different parts of her kingdom, traveled far, met many people, and did amazing things she would only dream of. It was all thanks to Sonic, whom she became rather attached to. She even encountered Blaze, another princess of flame, who offered to teach her how to control her powers before an untimely, tragic death. Elise could cry all she wanted, for grief was impossible to stifle. But when Mephiles snuck up and killed Sonic, her closest friend and symbol of salvation and freedom- she snapped. The flames of Iblis activated from within her soul, and she fought Mephiles with more power than she's ever used. It was more than she could take- especially without training. Her anger eventually consumed her, and Iblis broke free of her, fusing with Mephiles. Timey-wimey stuff happens, too much to really rewrite, but when Sonic and Elise go into the past, right before she becomes the vessel and she is meant to blow out the flame- saving so many people from death... she hesitates. Because it means she'll forget all about Sonic. She'll forget all their adventures, all her happiness, all her exhilaration. (She'll miss her power over fire too, even if she wouldn't say so) But Sonic insists that their timeline will always be real to them, even if they don't remember, and convinces Elise by reminding her that- with the flame inside of her gone, she'll finally be free. Free to let her emotions go, free to command her kingdom like a queen she was always meant to be. So she blows out the flame, and resets all that happened.