The Good Guys
Fionn Mac Cumhaill
Fionn Mac Cumhaill is one of the legends of Mithryn, and for good reason. With the help of Cu Chulainn and Scathach, he destroyed the Fomorian power base utterly within his mortal lifespan. He is superhumanly strong, fast, and durable, and has the ability to change his shape. When he needs to, he can know anything he desires, due to the magic imparted from eating the Salmon of Knowledge.
He has chained himself up in the Black Pit beneath Castle Dublin. He disappeared soon after the Fomorians were defeated.