Dana

Dr. Dana (ダナ先生) is an elderly doctor who works at Dalmary Town. He pretends to treat Meliodas who was injured by Gilthunder in the Forest of White Dreams.

Appearance
Dr. Dana appears to be an ordinary elderly doctor, who has a lot of knowledge about medicine and herbs. He wears old fashion round glasses and has a long hairy beard.

Personality
Dr. Dana is shown to be a calm person. He is also dedicated to his work as he didn't stop treating Meliodas even when Friesia was destroying the town. He cares deeply about his daughter as he was willing to poison Meliodas just to get her back.

Baste Dungeon Arc
Meliodas was brought to Dr. Dana in order to heal the wound he received from Gilthunder. The doctor started treating Meliodas' wound and was surprised that he was still alive after a very deep sword wound, and also a burn that resembled a lighting burn. While Diane was fighting Friesia, he gave Meliodas a special medicine he prepared, saying that it would give Meliodas "peace", for which he was thanked by Golgius a few minutes later. Dana then reveals that the medicine was actually a deadly poison was made from Wolfsbane, Belladonna, Tiger Beetle Leaf and that Meliodas was dead. However, Meliodas gets up after Golgius tries to take Meliodas' sword, surprising Dr. Dana. After Golgius quickly escapes, and Dr. Dana tries to follow him and finds Golgius, who was also found by Meliodas and Elizabeth at the same time. Dana begs Golgius to return his daughter, since although Meliodas didn't die from the poison, Dr. Dana had made him drink the deadly poison, just as he was instructed. Golgius disappears, telling Dana that he will return his daughter, but only in the afterlife, and stabs Dana from behind. After Golgius' defeat by Meliodas and subsequent escape, Elizabeth rushes to his side to see if he is alive. Dana then apologizes to them and explains that his daughter, Cenette, was kidnapped and he 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 is destroyed, he is shown to be alive, much to the surprise of Meliodas and Hawk, and is reunited with Cenette. He says that he doesn't know what happened and reveals that his huge wound had mysteriously healed very quickly, just like Meliodas' wound. When Cenette tells him that trying to kill Meliodas was not his fault, but Seven Deadly Sins' fault, he argues in favour 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 later shown to be doubting the fact that the Seven Deadly Sins are actual criminals, and thinks that he feels the presence of an immeasurably great will.

Abilities/Equipment
Dr. Dana is a skilled doctor and is knowledgeable with poisons.

Cenette
Dr. Dana cares deeply about his daughter, going as far as to killing someone to get her back.

Golgius
Dr. Dana was forced to assist Golgius of the Weird Fangs. He made a deal with the knight in an attempt to assassinate Meliodas with poison, in order to save his daughter who was held as an hostage.