"Why... are you... crying for me...? I'm... sorry... I just wanted... to get my daughter back... And for that, I... even if it was an order... tried to kill a young boy who had nothing to do with this... In the end... I couldn't rescue... my daughter... I reap... what I sow... Sennett..."
Dana wears old fashioned round glasses and has a somewhat shaggy beard.
Dr. Dana is a calm person and is very dedicated to his work as he did not stop "treating" Meliodas even when Friesia was destroying the town. He cares deeply about his daughter as he was willing to even poison Meliodas to have her released from imprisonment.
Meliodas was brought to Dr. Dana in order to heal the wound he had received from Gilthunder. As the doctor started treating the wound, he was surprised that the young man was still alive after having received very deep sword wound, and also a burn that resembled a lighting burn. While Diane was fighting Friesia, he made the unconscious Meliodas a special medicine he prepared, saying that it would give him "peace", for which he was thanked by Golgius a few minutes later. Dana then reveals that the medicine was actually a deadly poison made from Wolfsbane, Belladonna, Tiger Beetle, Henbane Leaf and that Meliodas was dead.
However, Meliodas awakes after Golgius tries to take Meliodas' sword, surprising Dr. Dana, since the poison was deadly and should have killed him. After Golgius quickly escapes, and Dr. Dana tries to follow him and soon finds Golgius, who was also found by Meliodas and Elizabeth at the same time. Dana begs the Holy Knight to return his daughter, since although Meliodas did not die from the poison, Dr. Dana had made him drink the deadly poison, just as he was instructed. Golgius, however, disappears, telling Dana that he will return his daughter, but only in the afterlife, and fatally stabs Dana from behind. After Golgius' defeat by Meliodas and the former's subsequent escape, Elizabeth rushes to his side to see and finds him in his apparent last moments. Dana then apologizes to them and explains that his daughter, Sennett, was kidnapped to force him into poisoning Meliodas, and he had just wanted to have his daughter returned to him. His hand then falls to the ground, with Elizabeth then bringing him back to his house.
After the Weird Fangs are defeated and the Baste Dungeon, destroyed, he is shown to be alive, much to the surprise of Meliodas and Hawk, and is reunited with Sennett. He claims to not know as to what had happened and reveals that his huge wound had mysteriously healed very quickly, just like Meliodas' wound. When Sennett tells him that trying to kill Meliodas was not his fault, but Seven Deadly Sins' fault, he argues in favor of Meliodas, saying that although he tried to kill him, the young man saved his daughter and stood up against the Holy Knights without hesitation. In the evening, he treats Meliodas, Elizabeth and the others to dinner to thank them and is doubts the fact that the Seven Deadly Sins are actual criminals, while thinking that he feels the presence of an immeasurably great will.
Dr. Dana cares deeply about his daughter, going as far as to killing someone save her from imprisonment.