Fotogramas.es had the original news, which indicated he would play a mutant dubbed Tornado, although Comic Book Movie received an update that revealed Álex González would, in fact, be playing Riptide. Here's a description of the character from Comic Book Movie:
"Riptide is a mutant with the ability to spin his body at an incredibly fast rate. He also has the ability to generate calcium growth from his bones that protrude through his skin, often taking the form of shurikens and spikes. When he spins, Riptide can release these growths at will from his skin, the additional velocity that comes from his spinning making them lethal missiles that can even punch through steel."