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Se puede cambiar el apodo en el juego justo antes de comenzar, hay una parte que dice personalizable, ahí puedes cambiar todo del personaje

I'm sorry you didn't like the demo, but there's no need to be rude to other people who are trying to help you!! As they said, you can change Angel's name in the character customisation screen. And if the demo is boring, you're not forced to play or enjoy it.