...
"Ah, yes." The proctor settled into his chair with a weary sigh. "I believe I have just the pony in mind. We had a student, years ago. Absolutely phenomenal magical ability, unlike anything we'd seen here before. She would've gone far. But..." The proctor heaved another sigh. "She was cruel and addicted to knowledge, to the point we could hardly keep her in class with other students. One day, she had an outburst that destroyed a classroom wall. We'd have expelled her right then, had she not disappeared of her own accord.
She still resides somewhere in town, I believe. Lucent Streak, her name was. I do hope she's mellowed out by now."
there sure are a lot of mares with light-themed names and prodigious magical abilities who are prone to outbursts and cruelty! honestly in retrospect it’s impressive Celestia got Twilight right