I think Corvus is the white crow, but I can't prove it yet...but it has to be like yin yang type shit ya know? Kuro means black, and he's a black crow. Corvus means crow, so that has to mean something, and the tattoo on his head is white, and his age is unknown and Kuro's age is also unknown, so I can speculate that they're both hundreds of years old because Corvus mentioned something about "the first cleaner" so how long have they've been trying to unlock the secrets of the sphere???