Sayori is an endless bundle of joy, happiness and fun, a silly goober, if you will, she is the youngest of the club, at 12 years old

Out of all the club members, she's easily the most friendly, she always sees the best of people and is always happy to make new friends,

Though she can be a bit of a ditz, and her head is often in the clouds, plus, her energy and kindness can sometimes lead her into trouble, and she doesn't have a lot of self-confidence, 

either way, her energy and optimism always brings a smile to everyone, 

being the youngest, her voice should be high pitch, but not too high pitch to the point where it's annoying, her voice should be how you'd expect a 12 year old would sound like