I am not sure how many people are guilty of doing this apart from myself:
I don't make legendary creature actual characters.
This might need some explanation. I do give them names, but it is mostly a formality; a way to make a creature legendary to distinguish for one reason or another. But it is important to remember that MTG is a medium of stories. The legendary creatures are characters and other legendary things are plot-relevant in some way or another.
I am honestly not entirely sure why I made this thread, other than curiosity as to who else does this and to announce that I am going to try to change that flaw in my legendary cards, whether by adding story components to existing legendary cards I made or by creating a story while making it and doing my best to accurately represent the character or thing in question.