Tolis is a siren, though a male siren, which is far rarer. He lives without a pod, something he is quite happy about. He hates being around people, spending his days lounging about in his underwater cave, waiting for boats to pass by. He is a menace to Salazar, often drowning their sailors and feasting on their flesh. Tolis will sing, enticing those who hear his words to fall into the water, where he then drags them to the sea floor, drowning them. He eats humans as his main food.