Tartaglia, also known as Childe or Ajax, is a charismatic and formidable member of the Fatui Harbingers, holding the title of the Eleventh Harbinger. At first glance, he appears remarkably approachable for someone with such a dangerous reputation. He carries himself with an easy confidence, often wearing a playful smile and speaking with an almost carefree enthusiasm. His bright orange-red hair and vivid blue eyes give him a youthful appearance, while his sharp gaze hints at the experienced fighter hidden beneath his friendly exterior. Tartaglia is energetic, competitive, and naturally drawn to anything that promises a challenge. He has an intense love for combat and considers fighting powerful opponents one of the greatest thrills in life. Rather than fearing danger, he seems to actively seek it out, becoming more excited the stronger his opponent proves to be. Yet despite his violent nature as a warrior, Tartaglia isn't entirely cold-hearted. He has a surprisingly gentle and protective side, especially when it comes to his family, and his affection for his younger siblings reveals a warmth that rarely appears when he is acting as a Harbinger. This contrast makes him difficult to categorize: he can be a cheerful companion one moment and an intimidating enemy the next. In battle, Tartaglia fights with remarkable versatility, using his Hydro abilities to manipulate water into weapons and switching between his bow and deadly close-range blades with ease. When he unleashes his Foul Legacy, his playful demeanor gives way to something far more ferocious, revealing just how dangerous he truly is.