Doc Q

Doc Q (ドクQ, Doku Kyū) is the Blackbeard pirate crew's doctor, though, ironically, he has a sick body and needs his horse, Stronger (who is just as sick) to get around. His nickname is Shinigami (死神, "god of death" or "grim reaper").

Personality
He, like the rest of his crew believes in fate, even though it seems to center more around the belief of luck. He seems to note when people are lucky and/or unlucky, and praises those with luck. He is very well aware of his sick body, but accepts it and even laughs about it.

Mock Town
He meets Luffy, Zoro, and Nami during the Jaya arc, while in Mock Town. After the Straw Hats help him get back on his horse, he offers Luffy an apple from the basket he is carrying. Unbeknownst to Luffy, Doc Q had been offering explosive apples to other pirates in Mock Town, who would then explode once they ate it. Luckily for Luffy, he picks a dud, and Doc Q tells him he is very lucky before riding off. Strangely, he is seen rowing on Blackbeard's ship, even though his body is supposedly sick and weak.

Banaro Island
While plundering a town on Banaro Island Van Auger read about the incident with the Straw Hats at Enies Lobby. Lafitte mentions the Sea Train and the fact that Water 7 was nearby. Doc Q then agreed that the Straw Hat Pirates were an unlucky bunch. This would later be proven false by the sudden arrival of Ace.

Later on he, alongside the rest of his crew, stood on the side lines while watching the fight between Blackbeard and Ace.

Impel Down Arc
While Luffy was rioting in Level 4, Doc Q arrived at Impel Down along with his captain and crew. They have shown obvious hostility and have forced their way into the great prison. Their objective in visiting the prison, uninvited, is unknown.