Mogo is a sentient and living planet. It is technically genderless, but it is often casually referred to as male. When it is desired, its affiliation with the Corps is shown with foliage arranged into a green band, marked with the standard Green Lantern Corps lantern symbol, circling Mogo's equatorial area.
In its early appearances, Mogo is not a social Green Lantern and its interactions with the rest of the DC universe are not well documented. It avoids announcing its presence, preferring to represent itself using pseudonymous holograms. In Mogo's first appearance, it is explained that the planet-sized Mogo's gravitational field would wreak havoc on any other planet it would try to "visit", hence Mogo "doesn't socialize".[1]
Bolphunga the Unrelenting, an alien hunter, was one of Mogo's first direct adversaries; having tracked the legendary Green Lantern Mogo to the planet where he apparently 'resided', Bolphunga subsequently spent years searching the planet for Mogo, examining various plants and animals for any sign of a power ring, until closer examination of patterns in the foliage led him to realize just what Mogo really was, prompting him to flee Mogo in a panic.
In one incident, it sent holograms to purchase Lobo's dolphins. When Lobo tried to retrieve them, a Mogo hologram persuaded him not to. The dolphins turned out to have a symbiotic relationship with Mogo, eating space debris that fell to his surface. Lobo never discovered he was dealing with a sentient planet.[2] At the same time, Mogo has allowed alien races to live on its surface and has been willing to change its climatic conditions to suit them. These inhabitants of Mogo may not always know that their home is alive and watching them.
When the Parallax entity, who was at that time inhabiting the body of Hal Jordan, destroyed the power battery on Oa and slew the Guardians, Mogo lost contact with the Green Lantern energy that helped sustain him. He traveled to Sector 1014 to seek the aid of Ch'p, unaware that his friend had died long ago. Having relied on the emerald energy of the power battery to sustain him, Mogo lost consciousness and drifted through Sector 1014 until he was discovered by a nomadic alien race. These aliens proceeded to strip Mogo of his natural resources and pollute his environment. Mogo's body reacted instinctively, creating constructs to hinder the aliens' efforts to exploit his resources. Mogo was finally rescued by Kyle Rayner, who used his power ring to reawaken the sleeping giant. Mogo offered to allow the aliens to settle on him and offered to take care of all their needs, but the stubborn beings chose to abandon their settlements. Mogo later revealed to Rayner that he was relieved the aliens had left, and that he had planned to give them terrible weather in retaliation for their pollution.[3]
This storyline contradicts a Green Lantern annual where Kyle faces the bodies of many dead Green Lanterns, Mogo included, all of whom try to destroy him.[4]
Mogo appeared in Green Lantern Corps: Recharge #2, requesting back-up against Rannian and Thanagarian forces. Green Lanterns Kyle Rayner, Guy Gardner, Stel, and Green Man were dispatched to clear out the enemy fleets and then enjoyed a respite on Mogo's surface (Guy made metafictional remarks about Mogo wanting to socialize, recalling the famous Alan Moore story).
With the restoration of the Green Lantern Corps, Mogo has taken on the role of a training and recreation planet for his fellow Green Lanterns. Soranik Natu, Kyle Rayner, and other Lanterns have traveled to his sector to ask for his counsel. Further, while defending Mogo from an attack by the Sinestro Corps, the Green Lantern Arisia explained that Mogo is responsible for guiding Lantern power rings without users to those who can overcome great fear, and says that "without him, the rings are directionless".
