According to Gregorios, he has lived his whole life in Apotos. Following the shattering of the Earth in the beginning of Sonic Unleashed, Gregorios' worries for the townspeople's safety and the planet's following fate let to him to developing a slight degree of insomnia. At some point around this time, Gregorios was possessed by Dark Gaia's Minions, with their influence causing Gregorios to lose interest in everything around him at night, including his own worries and did not care what would happen as the planet now had shattered, but would then return to normal during the day.When Sonic the Hedgehog and Chip arrived at Apotos, Gregorios met the duo and was pleasantly surprised to see these new travelers. Uponn meeting them, Gregorios gave some advice for Sonic and Chip to go by when navigating in Apotos, and provided directions for them to the local Entrance Stage. He was then asked by Sonic if he had seen Chip from somewhere before, but Gregorios told them that he had no recollection of seeing him. During the following nightfall, Gregorios met Sonic and Chip again. However, due to the influence of Dark Gaia's minions, Gregorios told Sonic and Chip that he was not shocked by Sonic's nightly appearance or in anything now that the world was ending.

(Voice Type) Make him sound like an old wise priest in his late 70's or 80's. ^^;