Some (horrible?) errant thoughts:
Arthur has no facial hair except a giant honking Walrus Mustache, Celtic style
Palamedes, a Babylonian pagan, worships Ishtar
A lot of Morgan le Fay and Guinevere's antics could be summed up by Taylor Swift songs.
Elaine (of Corbenic) is a gym girl
King Mark neighs when no-ones around
Gawain IS fluent in Chinese. So is Elaine of Corbenic for some reason (!!??)
Tristan and Isolde have had shapeshifter sex with each other using every animal form they could find in the forest. Tristan has indeed given birth to many animal children.
Merlin has many bastard daughters, who are all feral and hairy
A hypothetical "original" version of Knight of the Cart has Melwas picking up the Sword-Bridge and smacking Arthur with it. It fails. Spectacularly.
Dame Silence is...
Uther Pendragon often comes back from the dead just to shit talk about Camelot to the court's face.
Igraine is a conwoman (she got it from her dad, Amleth). This embarrasses Morgan but not Elaine and Morgause.