Murillio was a courtier and one of the regulars at the Phoenix Inn in Darujhistan. He was a friend of Crokus, Rallick Nom, and Coll and was an associate of Kruppe. He was described as lanky, having a long, elegant frame. On his first appearance he was dressed in a bright-green, soft billowing shirt and fine tanned soft pantaloons. He was fastidious in his appearance. Murillio was an accomplished duelist, having studied under Carpala the famed instructor. He hated priests, thinking them "self-serving confidence artists...swindlers of the gullible."