Merlin

Merlin (Mārin マーリン) was the elderly wizard who was in a party set out to kill Monster Lord Alice XV. Along with Marcellus, Lazarus, and Karen, they realized too late of Alice XV's wishes for coexistence, and then sought to make amends for their horrible mistake.

However, a young Alice XVI spotted her deceased mother and killed Merlin and Karen out of blind rage, prompting Marcellus and Lazarus to found Ilias Kreuz.

He can be recruited along with Lazarus in Part 2 during the Grangold siege.

It is unknown how he survived and now the Don Father in Monster Girl Quest Paradox.

Trivia

 * In the Arthurian Legend, Merlin was the greatest wizard in history that served as the adviser to King Arthur.