If you have seen episodes or even small clips of MLP:FIM. You should already know who Twilight Sparkle is and what she sounds like, especially. if you grew up in the 2010s. But for the 1% of you that don't know who Twilight Sparkle is. She's an alicorn princess that is very intelligent and responsible. While I wouldn't say she's boring. She does tends to be straight-girl when the opportunity arises and needs to get every other ponies in check and order. She also is known to talk in a scientific language occasionally that no one, other than Spike, can understand. While it's never been confirm what age Twilight Sparkle is, we can assume in human years, that she around the age of a young college adult girl or at the very. least a late-teen girl.