The Classic Versions: Alter Origin Sonic & Alter Shadow Sonic
from Five Nights at Sonic's: Mega Merge Max Mix (Alternate Maniac Mania)
Which will later turn into The Modern Versions: Origin Sonic "Midday-Up!" &
Shadow Sonic "Midnight-Up!" in Five Nights at Sonic's: Fierce Forces.

Fun Fact: Even though Origin Sonic "Midday-Up!" changes his appearance to
be more similar to the Modern Version.
He's still considered as and the only "Present Classic Character" in Fierce Forces
(Due to the plot and reference to Sonic Forces)