Master of Noble Phantasm Outsider

"What kind of strange world is this..."
The time traveler Conan Shan came to a very strange world where multiple worldviews merged.
There is Changkong City here, but there are no Valkyries, no destiny, and no pure love warriors with strange names.
There is Academy City here, but there is no Unified Council, and there is no androgynous upside-down man.
There is Fuuto here, but there is no half-separated Kamen Rider, and no monster memory.
Here there is the wizarding world and the Ministry of Magic, and the famous Hogwarts School of Witchcraft and Wizardry, but there is no White Devil and no savior Lightning Scar.
Good news: All stitched
The bad news: no seams
"A world that only seems to be true, but without plot characters, this is not a world of anime at all..."
In this patchwork world, the first problem that the traveler faces is how to successfully and safely exit the "Holy Grail War" that he has been inexplicably dragged into.
But that's not the point.
The focus is on the Servant named "King Arthur" that Conan-san summoned passively.
"Why is my King Arthur a bearded hunk? King Arthur wasn't supposed to be a boy!"
Stranger Arrives in the Stitched World