Crimson Star
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The Crimson Star smiled, his red hair becoming like flames, as his white skin turned orange I color, with red patterns. His boyish body ended transforming into that of a small woman instead, her true appearance.
Not only was she able to transform her appearance and voice, but she was also able to unleash a destructive igniting fire everywhere, which could consume anything around her surroundings.
While glancing at her hands, she conjured two enormous fireballs, about to blow up the entire train with her included, and then just escape.
As someone with the power of an Esper of Fire, she could not only manipulate and create flames, but she could even turn into flames herself, meaning that she was immune to most damage.
However, Psychic Energy-infused attacks could deal damage to her, such as those from the Bullet Demon, who almost ended killing her!
"You'll see, Bullet Demon," she smiled maliciously. "Go fuck yourself!"