My Little Pony: Winter's Children

(Multiple female protagonists have sex changes. The author likes ponies a bit but not a lot with Yingxue. Try not to be OOC and will use some comic settings but mostly animations) A thousand years ago, the unicorn foal Ye Luoyingxue was born in the wind, snow and night. He was a miraculous son of the symbiosis of natural magic and the "Wind Demon". He was accepted as a student by Star Swirl in the ancient Unicorn Castle, and became Equestria's "Prince of Winter" with his talent in manipulating ice and snow. The day-to-day palace life made him fall into self-doubt: in front of his sister who could raise and lower the sun and the moon, he was just an "insignificant weather manager." In order to find the meaning of existence, Yingxue created a clone to hide it from her sister, and embarked on a journey to escape from the palace. However, this seemingly willful runaway made him experience a lot. After returning to his hometown, he embarked on his journey of friendship, but soon he unexpectedly changed from a male unicorn to a female unicorn. This is a story about self-identity, growth and redemption. Will he eventually understand that true strength is never a defined role, but the light of inner choice? (This book is written in third person third person!! The author will change the perspective in later chapters!!)