Originally Posted by
PyroSikTh
Johns run is the only essential Green Lantern (although a case could be made for Emerald Twilight and Final Night to sedge into Johns run).
Rebirth
Secret Origin
No Fear
Revenge of the Green Lanterns
Wanted Hal Jordan
Sinestro Corps War
Rage of the Red Lanterns
Agent Orange
Blackest Night
Blackest Night: Green Lantern
Green Lantern: Brightest Day
War of the Green Lanterns
Sinestro
Revenge of the Black Hand
Rise of the Third Army
Wrath of the First Lantern
GLC at the same time is a good companion, but is certainly not essential.