Dalton Strauss (ダルトン・ストラウス, Daruton Sutorausu) was Renee Paramedes Branvillier's alchemy teacher and the headmaster of the Third Library in Lotto Valentino. He is also one of the three surviving pre-1711 immortals, along with Renee and Archangelo, before the generation of the Advena Avis.
In 2003, Dalton serves as the Third Library's head librarian and manager.
Dalton is an elderly, white-haired man with a long beard and mustache, who carries himself more like a warrior than an alchemist. He often wears a wide-brimmed hat atop his head in the 1700s, as well as a wooden right arm - which he briefly replaces with a metal hook at the request of one of his students (who thinks Dalton looks like a pirate). He switches back to his wooden arm once it is repaired.
In 2003, Dalton's prosthetic is much more realistic.