He is a slender man and is given to frowning.
He was one of the nobles who didn't support Morgase Trakand when she assumed the throne after the Succession, and was forced to swear fealty to her afterwards.
Lir and his armsmen ride with the army when Arymilla mobilizes her entire force and attacks the Far Madding Gate. Arymilla's army is hit behind by half of Elayne's force and in the end Arymilla's army surrenders. Lir is brought before Elayne Trakand and publicly throws his support behind her.
He is present at the meeting with the neutral High Seats and Elayne. There, they throw their support behind Elayne giving her the required Houses she needs to obtain the Lion Throne.
Elayne gives him permission to view Caemlyn from afar after he tries to insist upon a siege to take back the city from the trollocs.