In-universe, how is it that no one knows of Credence/Aurelius? Surely he would have come up at some point in Magical History? Obscurials are rare, yet alone one that survived to adulthood. The incident in New York alone should have put him in Wizarding history forever, let alone his role in the war with Grindelwald and the events of Bhutan. Not to mention he turns out to be Dumbledore’s nephew - Dumbledore becomes famous after defeating Grindelwald, Credence should have been mentioned at some point at least in passing.
Consider, though, that he is well-known, and people have heard of him.
Only they’ve only heard the name of Credence Barebone, and nobody’s heard of Aurelius Dumbledore.
Or vice versa - people have heard of Aurelius Dumbledore; his identity as Credence Barebone is unknown.
Or maybe people have heard of Aurelius Dumbledore (an illegitimate son of Aberforth Dumbledore who died young. Aberforth doesn’t like to talk about him. Aberforth doesn’t like to talk about most things, really.) and also Credence Barebone (the American Obscurial who joined Grindelwald but defected) but they haven’t connected the two. They don’t know that they’re one and the same.
Or maybe Credence did come up in Magical History but Binns’ class is mind-numbingly boring so nobody remembered him.
GRINDELWALD’S VISIONS - FANTASTIC BEASTS: THE SECRETS OF DUMBLEDORE (2022)
“Dumbledore asked that I convey a message. Grindelwald has the ability to see snatches of the future. So we have to assume that he’ll be able to anticipate what we do before we do it.”
Headcanons for the boggarts of the Fantastic Beasts characters
Credence Barebone - Mary Lou Barebone. Yes, even years later, after Paris and Nurmengard.
Chastity Barebone: Mary Lou Barebone
Modesty Barebone - Mary Lou Barebone
Mary Lou Barebone - the stereotypical caricature of a witch
Newt Scamander - The world inside his suitcase destroyed, with all of his creatures dead (I imagine that his worst fear of having to work in an office changed, since his job wandering the wilds and finding different magical creatures is pretty much the opposite of that, and he worries what will happen to his animals if it's decided they're too dangerous and his suitcase is taken away, like at MACUSA that one time).
Leta's was already shown.
Theseus Scamander - Newt dead or injured.
Yusuf Kama - his father telling him that he failed to avenge his mother.
I couldn't think of anything for Tina, Queenie, or Jacob.