Isabella Yew

Isabella Yew (イザベラ・ュゥ Izabera Yū), formerly referred to as Sister Isabelall (シスター・イザベラ Shisūta Izabera) is a former nun, stationed at a church in the far reaches of the the Pergrande Kingdom, the largest country in the entirety of Earth Land. The church had a dual function as a medical facility, and Isabella became skilled enough in her the healing arts to become one of the foremost physicians in the church. However, a certain event led to a backlash within her magic, causing magic that was meant to close wounds to reopen them instead. This backlash had a horrible impact on Isabella, and led to people throughout the country to be fearful of her abilities, refusing to come to her for treatment, even in times of war.

She was eventually given the name the Witch Doctor of Fresh Wounds (生傷の祈祷師, Namakizu no Kitōshi). Being shunned by others, due to their fear, heavily impacted her own self-confidence, which only worsened her skills, causing her magic to become ever more skilled at taking lives rather than saving them. Due to her irrational fear of killing others, Isabella fled the church, and the kingdom, choosing to go into hiding rather than be persecuted by her former peers.

Trivia

 * Isabella's surname, "Yew", is in direct reference to the Yew tree, which is believed to hold a special connection in regards to life and death. Isabella's magic, which essentially borders the domain of both dimensions, is similar in this regard.