Macros the black is a good guy from the novel, Magician by Raymond E Feist
He is a servent to the god of magic and thus is the most powerful magician ever, travels through time and space to fix problems - a bit like a poorly clothed Dr Who that doesnt need that screw driver or tardis.
In the book he mentors one of the main characters by visiting his dreams.
Ultimately leads his pupil through a hard time resulting in....wont ruin it for anyone reading the book.
He is called by his full name by those who are superstitous, who have heard old wifes tales etc. They talk of him being a dark sorcerer which he is not.
He is also known by this name by those who know the real him and see him as their friend.
I get what you are saying and may shorten my username.