This is the Amalgam Universe combination of a Guardian of the Universe (DC)and Uatu the Watcher (Marvel).

Uatu the Guardian is a member of one of the oldest races of beings in the universe, dating back to its origins. They posses vast cosmic powers, but have taken a vow not to intervene with the dealings of the universe. It is Uatu who warns the Challengers of the Fantastic of the coming of Galactiac to Earth, thus breaking his vow.

It is possible that these Guardians have some connection to the hero Iron Lantern, or Oa, the Living Planet.

It is also possible that there exists a rebel Guardian who works in conflict with the others, just as DC's Guardians have one rogue, Krona, and Marvel's Watchers have the rogue Watcher Aron.