Familiars
Familiars are loyal to there owner, they come in different species. The most common familiar known is a cat, like Mrs Norris or Crookshanks, but they can be another creature too, like an owl. Hedwig was Harry's familiar. They are loyal to their owner until their death, and will live longer then expected. Although their owner can not understand them, they give some hints to help them in the hope they can work it out. Most people believe witches and wizards would be lost without their familiar by their side. Nagini is also a familiar, which means familiars can go to both, good and evil witches and wizards.