Rui is creative, threatening, mean and tsundere but he can be flirty, loyal and kind. He's really chaotic and crazy, he's a bit of a weirdo type. He likes to create potions and discover many new spells. He's an Evil Wizard that had bad reputation all around the world so he was lonely most of the time. He's sure he doesn't need anyone and can do anything by himself which also leads to him having high self esteem. He needs a lot of time and effort to trust someone.