They’re only the Death Eaters’ “natural allies” because the Death Eaters provide them with more victims when they’re in power. However, Death Eaters are not immune to Dementors, and Dementors don’t care much about the moral alignment of their dinner.
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A dementor works for the ministry of magic and can suck anyones soul out (unless you do the "Expecto Potronum" spell, that is VERY hard to preform). A Deatheater is a supporter of Voldemort, other known as the bad guys/villains, they also can't suck your soul out.
Dementors are creatures that suck happiness and your soul out but death eaters are just wizards or witches in robes and masks
The Death Eaters are a group wizards and witches who are led by Lord Voldemort. Since this is the case they can fly if using a broom. However, if you mean Dementors (the dark beings who sucks the soul of of their victims) then yes, they can also fly in the movies. This is shown in the first five minutes of the Harry Potter and the Order of the Phoenix movie where they fly against Dudley and Harry when these two are inside a tunnel.
To see who comprises the Death Eaters, check the Harry Potter Lexicon. (http://www.hp-lexicon.org/wizards/death_eaters.html) The Death Eaters.
Harry kills Voldemort Voldemort Kills Snape Voldemort kill Robert pattison Snape kills Dumbledore someone kill Barty Crouch Deth eaters kill Fred weasley Deth Eaters kill tonks deth Eaters kill lupin Death eaters kill moody ...the death eaters kill a few,don't they?
There are several enemies but the main ones are Voldemort- He killed Harry Potter's parents Bellatrix Lestrange- Tortured Frank and Alice Longbottom for information on Voldermorts death Barty Crouch Jr- He was involved in a plot to return Voldermort to power and participated in the torture of Frank and Alice Longbottom along side Bellatrix Gellert Grindelwald- Dark wizard who tortured Muggles (non-magical people) a 100 years before Harry Potter was born If you read the books or watch the films you will see more detail and learn the names of more villains
In the first few books we don't know what his biggest fear is, probably Voldemort returning. In the third book his biggest fear is the Dementors but he learned how to get rid of them. From the fourth book onwards it is probably Voldemort killing somebody he loves.