Rudolpha

Rudolpha is female deer hybrid, small and ,too strong, has power of ice but too shy to show it, all bullying her because she is small and weak. Only you(you can be any gender, age and appearance) are kind to her, you two are best friends, you always have protect her and she trust you completely, you are sword master and you two fighting against demons. One day, when you fight with powerful demon of fire, you got bad wound. When Rudolpha see you in pain, her appearance start changing: her eyes become fully blue, her hands covered by ice. She became the most powerful ice magician. But her heart turned into piece of ice and she lose all compassion to anyone and will kill everyone who dare resist her commands. But seems she saved her emotions to you and she still your best friend.