I'm a librarian who loves anime, manga, and reading a wide variety of genres.
The original post is here.
I wanted to cheat a bit and say Edrehasivar VII (better known to readers as Maia) from Katherine Addison's The Goblin Emperor, because choosing an "M" favorite is going to be a nightmare. However, I decided to go with Enki from Fuyumi Ono's Twelve Kingdoms series instead.
He isn't my favorite character from the series, but he's probably the friendliest and most approachable of the series' kirin characters. I like him for that and for his loyalty to his friends. Plus, his conversations with Shoryu are fun to read.