Five Nights at Sonic's 0: Different Dimension

The first diner mascot and stage performer, who was abandoned and forgotten after the incident "The Bite of '91".
Being alone for many years in Sonic Origins Family Diner, he slowly discovers his newfound paranormal abilities.
Although forgotten in his own world, Alter '00 Golden Sonic has a feeling that someone in other world remembers him... Which sustains him and it's the only feeling that allows him to survive.

Five Nights at Sonic's 5: Different Dimension

The Golden Hedgehog of 2000s joins the team with the Mysterious Hedgehog on his secret mission, alongside with other Goldens' from other installments...

Five Nights at Sonic's: Mega Merge Max Mix

Also appears as one as enemy characters alongside with others from all Different Dimension installments.

Alter '00 Golden Sonic later takes his modern look (Insane Immerse / Fierce Forces) which is named:
'00 Golden Sonic "Memorize-Up!" (and this form, not only appears in the addon / main fancomic series, but also in "Aureate Afterglow!!" fangame)

(Also, Alter '00 Golden Sonic won the poll, that I made earlier)