User blog comment:CrimsonWarden/Nazarick's NPC Level Count/@comment-26952857-20160916072620/@comment-212.109.132.225-20160917143938

If i remember correctly, It was directly said, Titus is only NPC in the Grand Library.

In vol 1, there were 30 Evil Lords of 3 different types (Wrath, Pride and Envy), in anime only one of every type appeared, so Evil Lords can't be unique customizable NPCs.