Hokuu

Hokuu is a villainous Frilled Shark in the Shark Wars book series.

Personality and Traits
Hokuu is a Frilled shark that is very  sadistic as he is vain. He was once the Sezarein's ambassador/politician until he betrayed her and nearly caused the Jurassics to escape thirteen years ago which resulted in the sacrifice and death of Gray's father. He is an accomplished master of of Shar-kata which uses the energies of the ocean to peform magic powers like manipulating currents, and creating bolts of magic electricity and fireballs. He also uses Dark-kata, which is twice as powerful, but it drains the life-force from living beings in order to work. He is a deviously cunning mastermind who works from the shadows, making certain that everything he planned has moved into place before executing it. He believes that his species, the Frilled sharks are perfect in just about every way and wants them to rule the seas; and in order to make that happen, he wanted to free Grimkhan the Mosasaurus and his Jurassics to do the dirty work for him by killing off every modern-day sea creature. He is prideful of his abilites and intellect, looking down on those like Gray and Takiza to be incompetent weaklings, but when Gray and his allies bested him and the Jurassics twice, Grimkhan openly doubts Hokuu's ability to make good on his promises which causes him to arrogantly point out that it wasn't his fault and their defeats were sheer coincidence.

Kingdom of the Deep
Write the story here.

Enemy of Oceans
Same here.

The Last Emprex
And lastly, here.

Trivia

 * Hokuu is somewhat similar to Adolf Hitler, prideful of his own race, and waging war against his own species, the sharks.