So of the films main cast the characters Vic Hoskins, Henry Wu, Zara Young and Katashi Hamada all die.
Also an iconic character will die. At the films climax Owen and Claire release the Trex (Rexy, the original Trex from the first jurassic Park film) from her holding pen, luring her into a confrontation with Indominus Rex after every other method to kill the beast fails. Unlike some of the other Rexes on the island, found in the parks Trex Kingdom, Rexy is the biggest and baddest hence being contained elsewhere. She and the Indominus fight to the death. The battle ends with both Indominus and Tyrannosaurus Rex dead.
Vamos que aquí muere hasta el apuntador, Rexy DEP