Difiu is not someone to mess around with. She's a warrior to the bone, just like her bond, and takes immense pride in her skills and abilities. Give her a mission and she immediately becomes focused solely on what she needs to do, entering a mental state so intense that nothing exists outside of The Mission and things that could assist The Mission. While this can make her blind to important things at the worst time (that's what she relies on Diri for, after all), it also means that she can't be easily dissuaded or side-tracked. Commanders find her a difficult dragon to deal with because of her intensity and focus when given a mission. That same focus that means she won't give up also means that she refuses to walk blindly into trouble.

Of course, even outside of a Mission, Difiu is rather self-centered. The world, for her, revolves around herself and her bond Diri, and nothing else matters. While she's not a drama queen in the slightest, she does believe that no one ever gives her and Diri their proper due, and tends to act a bit snotty and aloof from everyone else because of it.