If you mean ASCII art, then it would simply depend on the Content of the Bio (like always). If you're trying to write something that would otherwise be in violation of the ToU/ CoC, then it would be the same thing. If it's
something that would not be any violation (using just Fonts/ Numbers "normal" writing), then it would be fine.
It's Context and Content, not a language or writing style that determines if something violates the ToU/ CoC.