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.

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 or unlucky, and praises those with luck. He is very well aware of his sick body, but accepts it and even laughs about it.

Abilities
As the doctor of the crew, Doc Q has the medical training to help them. He also uses apples that have been mixed with explosives to give to his victims.

Doc Q is also known to be carrying around a bag on his back. In present times these bags are usually scythe bags where scythes are kept. Since Doc Q's nickname is the "Grim Reaper" and is always seen carrying the bag on his back we can assume he has some skill with the scythe. However in the series he has not been shown yet opening his bag, even agaisnt the battle with Ace or breaking into Impel Down. So from this fact we have not seen in his bag it could even not be a scythe but could more possibly be one.

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 still unknown but Blackbeard said that it is something that will shake the world to it's core. Furthermore they stated that Luffy was a very lucky kid.

After exchanging words with Impel Down's mass breakout army, Doc Q and the rest of the crew are caught and poisoned by Magellan's Hydra technique. Later, the whole crew is saved by an antidote from former Chief Guard Shiryuu, who accepts Blackbeard's offer and joins their crew.

Translation and Dub Issues
His nickname is Shinigami (死神, "god of death" or "grim reaper").