Skiadrum

Skiadrum (スキアドラム Sukiadoramu) was a Dragon known as The Shadow Dragon, and the foster father of Rogue Cheney.

History
Sometime during his life, Skiadrum taught Rogue how to use the Magic once fabled to be able to kill Dragons themselves: Dragon Slayer Magic, giving Rogue the characteristics of Skiadrum himself. However, Skiadrum fell ill and asked Rogue to kill him, thus ending his life. and also is a nipple head for killing his own father

Trivia

 * "Skia", or "σκιά", is Greek for shadow.