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"When there is a true desire in the heart and that desire is strong enough... that is when he finds real strength that even he did not know he had!"
|Pre-Timeskip | Post-Timeskip|
|Alias||First Son of the Sea (海上の長男, Kaijō no Chōnan)|
Demon Shark (鬼鮫, Onizame)
|Previous Occupation||Dark Mage|
|Base of Operations||Pergande|
Koga Kurotsuchi (古賀黒い土, Kurotsuchi Koga) also known as Onizame (鬼鮫, Demon Shark) is a former Dark Mage turned traitor, having been responsible for single handily destroying his former guild, as a result he has gained the scorn and hatred of every Dark Mage and Guild in Fiore. Due to his past affiliation with the dark side of the magic world, Koga is not well liked by the Magic Council. He has since moved to Pergande and is currently a part of Zephyr's team, alongside Simon Vista and Arya Buchanan, trying to atone for the sins he had committed during his days as a dark mage.