She was born as the princess of the Kingdom of Greenwood. As she was growing up, she was evaluated by the Kingdom of Greenwood's Adventurers Association as a Level 40 Archer. When her eldest brother died, her other brother Keera made advances on her to continue the bloodline. She eventually ran away, taking some treasures for finance, in order to both get away from her brother and to see what she can do herself. least where it concerns magic or archery, or both. It took hours of practice for Diablo to learn Mana manipulation to the point that he could attempt to remove Shera's slave collar, despite the fact that he's level 150 and already a magical powerhouse, and Medios, the one teaching him took 12 years to learn it. She masters it completely, without practicing it herself, by simply being his practice model,

She is really uncomfortable concerning her small chest, as it's not only rare for a Pantherian but also she sees it as a huge disadvantage in trying to win Diablo's affections. She doesn't object very convincingly when Shera plays with her body, and she blushes when Diablo has her share Alicia's bed until such time as Rem gets accustomed to the idea of sharing a living space with Krebskrum. Despite devoting her entire life to destroying Krebskrum's

On Earth as a human, Takuma Sakamoto has no outstanding abilities except for being an expert at playing video games, especially Cross Reverie. He got his character Diablo to the counter-stop level of 150 as a Sorcerer and mastered all of the Elemental magics and had the Combiner sub-class. The arrangement of his stat distribution and skills, his job-class title is 《Sorcerer of Annihilation》. When he came to the other world and became his game character, he is able to use them as well and he can even adjust it to make an ice cup filled with water appear out of thin air. Also after coming to the other world, he might have picked up the chef sub-class and may have surpassed level 150 as a Sorcerer.

He has been appraised by Emile Bichelberger as level 40 Warrior when they first fought & met. He decides to level up after facing the Fallen who infiltrated the Kingdom of Greenwood in Volume 7. In Volume 8 he trains and ate Gold Fruit to level up to get the current Master Swordsman Graham, Graham Sasara, to teach him to reach pass the limits.