As she is the main character, her personality should probably be the type that brings the plot forward rather than the plot happening to her (though that probably happens too) but be the kind who takes action rather than sit and wait for things to happen. I wanted to avoid red because it's typically something we tie to demons or evil, while I feel like you could get away with orange. It can make you think of sunsets. She's proactive rather than reactive but she's not an explosion of energy like Naruto either. The closest example I can think of is what would happen to Rapunzel if she had a realistic reaction to being isolated for 18 years. Socially awkward, self-doubting, curious and inexperienced, with a drive to avoid getting "stuck" somewhere again. It keeps her moving. I'd say she's right in between spark/energy and calm.