Witch

"Wilona Walwyn, a kind and doting woman in her early to mid twenties with an elder sister personality and mindset. I imagine her to have a rather lilting and mature voice with a certain warmth a mom might have towards her kids, while also having a "Tries to act older than she really is" vibe. Likes to show off in the presence of younger girls in the hopes of earning their admiration and recognition. Kinda like Megumin in that she hyperspecializes in a single aspect of magic, but rather than explosions its concentrated beams of destructive energy. Can only truly be comfortable in areas filled with mana that would normally be lethal to average people due to a rare disease she has which means she's constantly leaking MP. "

Source: https://www.pixiv.net/artworks/129125553