Mako

One of Zodiac's Apprentices. They're very talented with their Curse, and are capable of stealth and great strength depending on what the situation needs. They have a strong sense of right and wrong, and have a rivalry with River - possibly spurned on by her history as a thief or her own Curse's detriments.

Curse of the Reef (Can shapeshift into various marine animals, permanently partially transformed and needs to submerge in water regularly)