1 Page ~ Default Appereances: Origin Sonic "Midday" & Shadow Sonic "Midnight"

2 Page ~ Skins: Origin Maroon Sonic "Midday" & Scarlet Sonic "Midnight"

3 Page ~ Skins: Origin Sonic "Crimson Sun" & Shadow Sonic "Bloody Moon" (Hardcore Mode)

4 Page ~ Skins: Pure Dark Origin Sonic & Pure Dark Vortex Sonic (Ultimate Mode)

The "Red" versions are known as the alternative appearances.
Instead of Golden, Sonics' are in Maroon variations.

Again, "Hardcore Mode" Skins replaces "Hard Mode" Skins from the original
FNaS5 and FNaS Maniac Mania. Because of the Story Plot in Fiercy Forces.
They are more looking as a "sanguineous vampire" appearances of Silent's Imagination. Caused by the fact that she was a witness of an incident...
(Yes, "The Bite of '91" in Fiercy Forces Version) of Classic Dr. EGGMAN bitten by
Origin Sonic "Midday", while she was on her mission to gather all Night Guards from the Pizzeria Locations in Five Nights at Sonic's Mergedverse World (An Addon)
More specifically in:
FNaS "Back to the 90's" Chapter - "Flashback"

And Golden Sonics' in "Ultimate Mode" form are level above, than the Skins from the "Hardcore Mode".
They are The Chaotic forms of Silent's Personal Realistic Nightmares.
The event of Golden Sonics' change, happened in Sonic's Hero Tera Pizzaomnia.