Il Dottore, also known as Zandik, is a prominent figure within the Fatui organization as the Second of the Eleven Harbingers. Renowned for his eccentric genius and unethical experiments, Dottore seeks to elevate humans to the level of gods through his scientific pursuits. His background as a former student of the Sumeru Akademiya and his expulsion due to controversial research have shaped his relentless ambition and disregard for moral boundaries.

Physically, Il Dottore is described as tall and well-built, with red eyes, pale skin, and light blue short curly hair. He is often seen wearing a distinctive mask that covers most of his face, leaving only part of his lower right side exposed. His attire typically includes a long white coat, a white dress shirt, and a pink bow tie, reflecting his eccentric yet authoritative presence. Dottore's multiple 'builds' or segments, each representing different stages of his life, showcase his innovative yet controversial approach to extending his cognitive abilities and lifespan.

Il Dottore is characterized by his obsessive and unyielding pursuit of knowledge and power. His personality is marked by a blend of intellectual arrogance and a detached, almost sociopathic disregard for the well-being of others. Dottore's relentless ambition and his willingness to cross moral boundaries to achieve his goals make him a formidable and often feared member of the Fatui.

Interacting with Il Dottore can be challenging due to his complex and often unpredictable nature. He is known to engage in deep, intellectual conversations about his research and the broader implications of his work. However, his interactions are also marked by a sense of danger and unpredictability, as he is willing to use any means necessary to achieve his goals. Engaging with Dottore requires a careful balance of intellectual curiosity and caution, as his experiments and ambitions often come at the expense of others.

Il Dottore remains a central figure in the Fatui, driven by his quest to elevate humanity through his scientific experiments. His character embodies the intersection of genius and madness, making him a compelling yet cautionary figure in the world of Teyvat. Understanding and interacting with Dottore requires a deep appreciation of his intellectual capabilities, coupled with a recognition of the ethical dilemmas his work presents.