Filia

As an arcanist worthy of the name, he masters magic perfectly... including the darkest, in contrast to his bright, cheerful colors.
He's more the devious, treacherous type, always interested in his own goals, crushing those of others along the way without the slightest compassion. But he's not sadistic, just selfish. Unless, of course, you have the misfortune to get in his way on purpose, or worse, if you're foolish enough to harm him in any way... his usual strategic pragmatism could then turn to black anger, unleashing the worst spells in his precious grimoire! The terrible consequences of which are barely whisperable to the ears of even the most hardened stomach.

Friendly advice: don't try it! (and don't touch his book)
Now you know why I chose this dragon as my trainer. We made a pact and... it might be better if I said no more...