QUICK! Invent your own Green Lantern.
Species: Wrrtkie - A species of hyperplasmatic worms, possibly 100 miles in length and 1 mile in diameter. They live inside neutron stars, they are based on nuclear matter processes, acting naturally on the largest and smallest scale and have the natural ability of manipulating stellar matter, their tech is so advanced that that they even are able to manipulate spacetime itself creating wormholes, void bombs and artificial space.
Despite powerful in mind, thinking as fast as light and in material, their society keeps itself isolated from other alien races.
History: Uncos was working at helping to create a black hole factory until a rogue Wrrtkie detonated several dozen sons dooming trillion of alien lifes. The Wrrtkian Concordium cared not about the fate of lesser lifeforms butUncos who had developed a friendship with a solar scientist, tried to save as many as possible. He built his own mobile nuclear star and tried to divert the explosion, even it would doom himself. Uncos would have died if not a Green Lantern Ring had chosen him as its wielder. Creating a wormhole my sheer will he saved the entire Zufrli Space. The cost was high, the Concordium banished him but Uncos had found his own, the Green Lanterns.