As of my last update in April 2023, I don't have specific details about a font named "AZ" by Christoph Mueller in the databases I was trained on. It's possible that it could be a newly released typeface or one that hasn't been widely distributed or recognized in the mainstream typographic community. However, I can provide you with a generic description based on the typical characteristics of contemporary fonts and the stylistic tendencies often seen in the works of font designers like Christoph Mueller, assuming he is a designer known for his meticulous craftsmanship and creative designs.

Given the context, a font named "AZ" by a designer such as Christoph Mueller might be expected to exude uniqueness and artistic flair, balancing between functionality and aesthetic appeal. Christoph Mueller, as a hypothetical designer, would likely infuse the typeface with characteristic touches that set it apart from conventional designs.

The "AZ" font could potentially feature a mix of geometric precision and organic curves, offering a fresh take on classic typeface families. It could cater to modern design needs, being versatile for digital and print media. The letterforms might exhibit distinct quirks, such as unusual letter angles, variable stroke widths, or inventive treatments of ascenders and descenders, adding personality and depth to the visual text.

Considering contemporary design trends, the "AZ" font could include several weights from ultra-light to extra-bold, enabling a wide range of expressive possibilities for designers and typographers. Each weight might be meticulously crafted to maintain readability and aesthetic integrity across various applications, from large display titles to body text.

Additionally, the font might come equipped with a comprehensive set of glyphs supporting multiple languages, ligatures, alternates, and special characters, enriching the typographic palette of designers who choose to use it. Such features would make the "AZ" font by Christoph Mueller not just a tool for communication but also an art piece, allowing for expressive and nuanced typography in diverse design projects.

While this description is speculative, based on the works of font designers who blend creativity with functionality, the actual "AZ" font by Christoph Mueller may have its own unique set of characteristics and design philosophies. Interested designers and typophiles should look for official sources or Christoph Mueller's portfolio for accurate information and visual examples of the "AZ" font.