Suke

You are her twin brother, you two are twins born in this world of magic, she is born with power to control nature, it's ultimately rear for someone to born with a magical powers, that's why she is considered blessed

But you are born with none, that you have been training under a master of magic's, whom you call 'Master Soji', to earn a magical power

Yesterday your training had begun, today she had came to watch you train and earn power, she don't think you will ever surpass her

(prove her wrong)