Forum: scifi.stackexchange.com
Tags: <harry-potter><magical-creatures>
Title: What shape would a boggart take if a person doesn't fear anything?
Question: Rereading the Prisoner of Azkaban, this interesting question(at least to me) popped in my head. What shape would a boggart take if a person is never depressed about anything, has no evil memories whatsoever for the boggart to feed on or has no fear?

Answers:
sents: text: In-canon, no-one knows.
text: Per Pottermore : A Boggart is a shape-shifting creature that will assume the form of whatever most frightens the person who encounters it.
text: Nobody knows what a Boggart looks like if nobody is there to see it , although it continues to exist, usually giving evidence of its presence by rattling, shaking or scratching the object in which it is hiding.
text: Boggarts particularly like confined spaces, but may also be found lurking in woods and around shadowy corners.
text: It's not even apparent whether a boggart actually has a physical form, but rather manifests as a force of nature: Like a poltergeist, a Boggart is not and never has been truly alive.
text: It is one of the strange non-beings that populate the magical world , for which there is no equivalent in the Muggle realm.
text: Boggarts can be made to disappear, but more Boggarts will inevitably arise to take their place.
text: Like poltergeists and the more sinister Dementors, they seem to be generated and sustained by human emotions.
text: Out of universe, there are very few people that lack a fear response and even those individuals (extreme psychopaths, sufferers of Urbach-Wiethe )
text: do have a psychological (but not physiological) ability to identify things that they dislike highly, even if they lack the mental capacity to actually feel a fear response.
text: It's possible that they would have the same response as a Muggle:
text: The more generally fearful a person is, the more susceptible they will be to Boggarts.
text: Muggles, too, feel their presence and may even glimpse them, although they seem less capable of seeing them plainly and are usually easily convinced that the Boggart was a figment of their imagination.
answer_details: author: scifi.stackexchange.com/users/20774/Valorum
score: 17
sents: text: Perhaps it wouldn't turn into anything.
text: From "Harry Potter and the Prisoner of Azkaban": So the boggart sitting in the darkness within has not yet assumed a form.
text: He does not yet know what will frighten the person on the other side of the door.
text: Nobody knows what a boggart looks like when he is alone, but when I let him out, he will immediately become whatever each of us most fears.
text: -Professor
text: Lupin
text: It is safe to assume then if one did not fear anything the boggart would not change at all.
text: You would know what a boggart's true form looks like.
text: Another idea is that the boggart would just guess what to turn in to, because as Hermione says: It can take the shape of whatever it thinks will frighten us most.
text: This wouldn't scare the person of course
text: but it might be rather funny...
answer_details: author: scifi.stackexchange.com/users/23685/BitNinja
score: 12
sents: text: They appear to have no form...
text: Therefore, if there is no fear for them to transform into they will probably not even materialize or attempt to.
text: Like dementors, they appear to feed off of emotions, so if there isn't something for them to feed off of, they will either leave or stay hidden.
answer_details: author: scifi.stackexchange.com/users/29220/Himarm
score: 2
sents: text: When children learn to bear with Bogarts they make them change to funny things, so it's feasible to supose that a Bogart facing a totally fearless character (suposing that's possible) will probably switch to any form he can get from their "victim's" mind and it can be related someway to fear.
answer_details: author: scifi.stackexchange.com/users/11069/Bardo
score: 1
sents: text: It would randomly switch between anything.
text: When Molly Weasley was trying to get rid of the Boggart at Grimmauld Place, the Boggart switched between her worst fears.
text: ‘R–r–riddikulus!’
text: Mrs Weasley sobbed, pointing her shaking wand at Ron’s body. Crack.
text: Ron’s body turned into Bill’s, spread-eagled on his back, his eyes wide open and empty.
text: Mrs Weasley sobbed harder than ever.
text: ‘R–riddikulus!’
text: she sobbed again.
text: Crack.
text: Mr Weasley’s body replaced Bill’s, his glasses askew, a trickle of blood running down his face.
text: ‘No!’
text: Mrs Weasley moaned.
text: ‘No ... riddikulus!
text: Riddikulus! RIDDIKULUS!’
text: Crack.
text: Dead twins.
text: Crack.
text: Dead Percy.
text: Crack.
text: Dead Harry ...
text: If a person didn't have a fear, their "worst" fear would tie between everything, therefore it would randomly switch between anything.
answer_details: author: scifi.stackexchange.com/users/110045/Pomonoli
score: 1

Summary of the answers:
If there is no fear for them to transform into they would probably not even materialize and stay hidden. However, if a person didn't have a fear, their "worst" fear would tie between everything, therefore it may randomly switch between anything.
A Boggart does not change shape at all if the observer has no fears since it takes on the form of the observer’s worst fear or fears. However, there is a chance that a Boggart would switch to all sorts of forms since the observer’s fear would take on the form of everything.