What role does Eoin play as a main character?

Eoin Mac Cairbre (pronounced Owen Mak Kar-breh) is the before-time Chief of Dun Arrogh via Clan Mórdha, cousin of Fergal, and a Prince of the Blood via Aife, his mother’s tie to the Ulaidia Dál nAraidi Clan. Eventually, Erin’s Protector, Taoiseach, and the Warriors of Destiny co-leader. Breanna accepts Eoin as her mate late in Stone of Destiny, once Dadga changes Beathe geas make room for love versus just being Hakon's destroyer, for if she cannot love Eoin, she cannot love her people or her land to wield the Triple Dàns. In Heart of Destiny, the become mates once more, with both having piece of Dagda's essence in them. That makes them both Tuatha deities. At this point, Eoin, is Breanna and her Warriors of Destiny Protector.