According to Rowling, Snape was the only Death Eater who could conjure a Patronus charm at all. "A Patronus is used against things that the Death Eaters generally generate, or fight alongside," she wrote in 2007. "They would not need Patronuses."
How was Snape able to produce Patronus even after being a death eater? Because only fundamentally good people were able to cast one. So the Death Eaters, minus one, were not able to produce a Patronus.
Severus Snape is the only Death Eater capable of casting the charm, as his love for Lily Evans was his one redeeming point.
Bellatrix Lestange would not have a Patronus. Death eaters, who are basically evil and live off fear and domination, seem to be incapable of producing a Patronus.
The successful casting of a patronus is not only reliant on magic ability, but also love, and happiness- things that he has no concept of. Voldemort is just as dark and evil as a dementor, and so it makes sense that he would not be able to produce something that could combat them.
1 Albatross
As the rarest Patronus in the Wizarding World possible, the Albatross represents an enormous bird that flies freely across any sea.
The albatross is the rarest Patronus on our list; the one belonging to the lowest number of Wizarding World fans. With the longest wingspan of any bird – up to 11 feet – the albatross surfs the ocean winds for hours, hardly even needing to flap.
The fifth year was boring for Sirius. Except for the fact that he had mastered the Patronus Charm, -his patronus was a black German Shepherd, and became an Animagi, -which was the same as his patronus, the fifth year wasn't very interesting.
When asked what shape Draco's Patronus Charm is, Rowling replied that, at least by the end of the sixth book, Draco was not capable of producing a Patronus, as it is not magic routinely taught at Hogwarts.
Snake. Remember in the fifth movie when he was fighting Dumbledore? Well he uses Fiendfyre and It takes shape of a snake. Your patronus is the animal that your Fiendfyre takes shape of.
In the world of Harry Potter as we know it, there are no recorded instances of a person who was sorted into Hufflepuff ever becoming a Death Eater, or any other kind of Dark Wizard for that matter.
Bellatrix Lestrange (née Black) is the first female Death Eater introduced in the books. Aunt of Draco Malfoy and Nymphadora Tonks. She was introduced in Harry Potter and the Order of the Phoenix. She is the most faithful member of Voldemort's inner circle.
There were presumably no Hufflepuff Death Eaters (Hufflepuff House boasted of being the only house never to produce any Dark Wizards).
Voldemort intentionally made six Horcruxes, but when he used Avada Kedavra on Harry, he unintentionally created a seventh Horcrux. Instead of dying, Lily's love for Harry created a counter 'curse' known as Sacrificial Protection and saved Harry.
Harry describes Umbridge to Sirius Black, saying that she's vile enough to be a Death Eater, despite not being one. Umbridge is also depicted to be a prejudiced person, despising half-breeds and Muggle-born witches and wizards to the point of firing Hagrid due to his half-giant birth status.
The stag is first seen in Harry Potter and the Prisoner of Azkaban when it saves Harry and Sirius Black (Gary Oldman) from the dementors at the lake. Originally, Harry believes it to be from his father, who somehow survived, but it turns out to be from Harry, who traveled back in time with the time turner.
A doe. And in his final battle with Lord Voldemort, Harry explained the significance of this to his adversary, and to us: 'Snape's Patronus was a doe,' said Harry, 'the same as my mother's, because he loved her for nearly all of his life, from the time when they were children'.
In a Q&A with Harry Potter fans on Twitter, J.K. Rowling was quizzed what Hagrid's Patronus would be. In reply, she wrote, 'Hagrid couldn't produce a Patronus. It's a very difficult spell.
Elder. The rarest wand wood of all, and reputed to be deeply unlucky, the elder wand is trickier to master than any other. It contains powerful magic, but scorns to remain with any owner who is not the superior of his or her company; it takes a remarkable wizard to keep the elder wand for any length of time.