Well Eldrazi titan, That's actually a good question
I would have to say Charmillion. No, that is not a typo. It was my first fanfiction, and at the time I thought that was how the fire chameleon was spelt. But when it was pointed out that I made a spelling error, I opted to keep it as just a sort of nickname for the lizard.
The story was based on Pokemon Mystery Dungeon concept. The character was suppose to be a supportive roll, but because of the spelling error, he got most attention from the readers, so I ended up making chapters specifically about him, and the story continued until the Nsider was closed.