Princess Charlotte Harmonia,the adopted sister of Princess Cadence(who was really Adagio Dazzle),the ruler of Crystal Empire.Her element,was the Elements of Harmony including magic, that she spreads from her castle,Everfree Forest,the secretly was recovered back to a normal castle.Her cutie mark was a music sign that is mostly the meaning of Harmony.While she sings every night,she spreads magic overall land.The ancesters' green multi-colored smoke is appearing on snow,right?
Her magic is the colr of her mane that is multi-colored smoke that looks the same as the color of her mane/hair that appears every night at Equestria,that means the Harmony.
(The pony on my profile is Princess Dianne Dazzle)