Ink can react very defensively, but usually only in the presence of other demons, as she sees them as a threat. When she comfortable she isn't at risk, she is much calmer. She could even be termed as quite good-natured.
Thank you very much. Ink isn't evil, but she is very much supposed to have that look. I'm glad you like her proportioning and anatomical structure, as well, as I had originally been concerned as to how her design would translate to paper. c: