New Olympian Clan
When gargoyles from the Olympian Clan and other (now extinct) nearby clans were invited by the ancient Olympians to join them on the newly founded land of New Olympus, many gargoyles decided to go. Together they became the New Olympian Clan. Since most of the gargoyles forming this clan came to the island for the same reason the Olympians did, namely to escape the persecution from humans, it seems likely they share much of the animosity towards humans that the other occupants of the island have.
Politically, they are considered citizens of New Olympus, however they are an entity unto themselves and are self-governed. For reasons unknown, this clan has become incredibly insular, even by New Olympian standards. They largely keep to their own and don't seem to interfere much with the rest of the New Olympian society. They did not even reveal themselves when Goliath, Elisa, Angela and Bronx came to the island during the Avalon World Tour.
Despite their isolationist nature, they will be known to the world by 2188, and will be founding members of the Gargoyle Nation. In 2198 their leader and the eggs from their rookery will be kidnapped from Queen Florence Island when the Space-Spawn attack Earth.
The physical characteristics of this clan is completely unknown. However, given that the clan had ancestors from any number of ancient gargoyle clans, they may be a very diverse lot indeed.
There currently are no known members of this clan, and it's likely they prefer it that way.