Rei was more or less confused by the professor's introduction to the class, misleading? A slight twist to the truth of the class? It just seemed to make things slightly more interesting in Rei's mindset, more fun than anything because she can show off her knowledge to a certain extent, she simply took her time to make an educated response while taking out a notebook and pen rather quickly and started tapping it. Subconsciously writing down thoughts of her past when she was a part of the White Fang, it looked to an ordinary student that Rei was taking prediction notes for today's class. To a student who's been trained with mentality and has a good natural read on people, can tell Rei is preoccupied with something from the past.
After about a minute of hearing other students respond to the question rather quickly and with basic knowledge sadly, Rei let off a heavy sigh as to the common responses irritated her. She got up from her seat, cleared her throat with an icy cold "Ahem!" and began to speak her response to the professor's question: "A semblance is a unique ability given to those who have unlocked his or her Aura and trained with it. Depending on the person's lifestyle, fears, aspirations and so forth, a Semblance mostly unique to that person will be bestowed upon them." Rei started with a vast introduction to her response, "For those who love the thrill of Speed, they will have a Speed-type Semblance which normally increases their speed in short bursts. For those who have the thrill of physical combat and want to retaliate with twice or three times the damage they've taken, a Semblance of the Berserk/Fighter-type will be given and so forth." she continued with a type of experience others may not know about, Rei then stopped for just a moment to catch her breath and finished her response, "There are Semblances that are specifically unique to one person, there others that simply are just slightly different from another person's Semblance. Though it's discouraging, how we live our life, what we fear and aspire the most actually impacts which Semblance we are born with, and we must make the most of the power given to us to be rid of the swarms of GRIMM."
Rei then sat down, and essentially almost forgot that the person she sat next to had introduced himself to her, she giggled and slightly blushed due to a small embarrassment and then sighed lightly to let go of her nerves. Rei then turned towards Oliver who had introduced himself to her, "My name's Hikari, Rei. Yoroshiku onegai shi [nice to meet you]," she then said with an accent on the Japanese Language, but could most likely tell she can speak the language moderately if not completely fluent.