Headcanon Idea: Simon Witnessing the Quiet Rapture
I know this idea might "main character" Simon a little too hard, but the concept of him being the only one to have witnessed the Quiet Rapture happen right in front of his eyes as a child, only to later meet the one who caused it, and then be chosen by it, would make a really intense foreshadowing beat in the awful plot that is Simon's life.
Because the Eye would have seen that memory. Simon would have been the only living thing in the universe to have witnessed it spread a black stain across it.
Imagine being an artist (eldritch creature), and you share your magnum opus (unholy terrors) with a crowd (entire universe) for the first time, and you accidentally flash it real quick before it is fully ready (or just to see what would happen), and only one person sees it before you tuck it away.
That person would live in your head forever.
I met a traveller from an antique land
Who said: Two vast and trunkless legs of stone
Stand in the desert. Near them, on the sand,
Half sunk, a shattered visage lies, whose frown,
And wrinkled lip, and sneer of cold command,
Tell that its sculptor well those passions read
Which yet survive, stamped on these lifeless things,
The hand that mocked them and the heart that fed:
And on the pedestal these words appear:
"My name is Ozymandias, king of kings:
Look on my works, ye Mighty, and despair!"
Nothing beside remains. Round the decay
Of that colossal wreck, boundless and bare
The lone and level sands stretch far away.
Percy Bysshe Shelley