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This question already has an answer here:

So far what I can remember from books, I have encountered Patronus of a form belonging to Animal Kingdom only. Here's the list:

  • Harry Potter / James Potter: Stag

  • Hermione Granger: Otter

  • Ron Weasley: Jack Russell Terrier

  • Albus Dumbledore: Phoenix

  • Lily Potter / Snape: Doe

  • Ginny Weasley: Horse

  • Luna Lovegood: Hare

  • Nymphadora Tonks: Jack Rabbit

  • Remus Lupin / Nymphadora Tonks: Wolf

  • Minerva McGonagall / Dolores Umbridge: Cat

  • Kingsley Shacklebolt: Lynx

  • Arthur Weasley: Weasle

  • Cho Chang: Swan

  • Seamus Finnigan: Fox

  • Ernie Macmillan: Boar

  • Aberforth Dumbledore: Goat

I know that a Patronus is unique to a person and it can change because of emotional upheaval.

But, what exactly is the rule of creating Patronus form? Can I create a Patronus of a form X-wings or R2-D2 or Millennium Falcon or USS Enterprise-E or TARDIS?

marked as duplicate by ibid harry-potter Jul 19 '18 at 4:37

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

  • Well I supposed if you were to identify as an attack helicopter your Patronus might look like one of those... – EvilSnack Oct 15 '18 at 5:24
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According to Rowling, corporeal Patronus' are animals. If you want to be pedantic, you can argue that incorporeal Patronus' are non-animal Patronus'. But as JKR says, if it's a true Patronus, it's an animal.

The Patronus is the most famous (and famously difficult) defensive charm. The aim is to produce a silvery-white guardian or protector, which takes the form of an animal.

[...]

The incorporeal Patronus is not a true Patronus and while it will give limited protection, it cannot provide the defensive power of the corporeal Patronus, which has the form and substance of an animal.
Patronus Charm by J.K. Rowling

(emphasis mine)

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