Princess Twilight Sparkle
Well I should hope all of you know who Twilight Sparkle is. Anyway, she banished Snow Star to a place among the stars many years back and knows of her returning, hence why she has sent Colour Splash to Ponyville to make some friends because she knows Colour Splash and her friends will be the new elements of Harmony. Twilight is very calm and collected now, but always seems to hold a sad glint in her eyes for the friends she's lost during her rule as Princess. Yet she knows they still live on in her heart and will often 'talk' to them at night when she is watching the stars.