From left to right: Guy Gardner, Kyle Rayner, Hal Jordan, John Stewart, and Kilowog

Name: Variable (Green Lantern is a title/position bestowed upon various sentient beings)
Origin: DC Comics
Gender: Variable (see first note)
Classification: Intergalactic police officers
Age: Variable (the Green Lantern Corps itself is billions of years old)
Powers and Abilities: Bestowed by the Green Lantern Ring - super speed, strength, durability, agility, flight, energy manipulation/absorption/projection, matter manipulation, telepathy, telepathic defenses, can survive in space, can cross-dimension and manipulate them to a limited extent, creation of solid energy constructs, can healing self and others, limited reality-warping and time manipulation, automatic shields, can grant power to others, can perform very fine manipulations on small - scale structures such as brain surgery or removing nanomachines from an organic being, intangibility (must be activated), can create forcefields, computer hacking and data processing/transmission, can analyze targets very quickly and accurately and identify most beings, substances, and anomalies, can open portals to other universes, can translate nearly any language, invisibility, illusion creation, can go into "stealth mode" to avoid emitting energy that can be easily detected, in this mood their costumes become black, can create copies of the ring, can summon other Green Lanterns
Weaknesses: Rings hold a limited charge, and need to be recharged with a power battery every so often, cannot be used without strong enough willpower, if the user has too much fear then they are unable to affect things colored yellow. If the Green Lantern loses focus or concentration their power will weaken (this can be accomplished via illusions and telepathic attacks, if said Green Lantern is unprepared for such things)
Destructive Capacity: Solar system level+ (for Guy Gardner, Hal Jordan, John Stewart, Kilowog, Kyle Rayner, and Sodam Yat), planet level+ for your typical Green Lantern
Range: At least star system level (around 40 AUs) to cross-dimensional
Speed: Massively FTL+ (can cross the universe in a matter of hours), at least FTL+ to massively FTL for your typical Green Lantern
Durability: Solar system level+ (for Guy Gardner, Hal Jordan, John Stewart, Kilowog, Kyle Rayner, and Sodam Yat), planet level+ for your typical Green Lantern, all GLs durability is further enhanced by their Auto-Shields
Lifting Strength: Stellar Class+ (for Guy Gardner, Hal Jordan, John Stewart, Kilowog, Kyle Rayner, and Sodam Yat), at least Class Y+ for your typical Green Lantern
Striking Strength: Class XPJ+ (for Guy Gardner, Hal Jordan, John Stewart, Kilowog, Kyle Rayner, and Sodam Yat), Class XJ+ for your typical Green Lantern
Stamina: Vastly superhuman+
Intelligence: Variable, every Green Lantern can competently use their rings and the rings themselves act as supercomputers allowing the wielders to gain nearly any kind of knowledge they desire
Standard Equipment: Green Lantern Ring, Green Lantern Power Battery (which is used to recharge the ring and is stored in another dimension, however they usually don't carry it around with them)
Notable Attacks/Techniques:

- Auto-aura: A passive ability that activates several enhancements simply by wearing the ring. Grants some increase in durability, regulates temperature and oxygen, allowing the wielder to survive in space. Allows for flight.

- Autoshields: A forcefield that activates automatically whenever a GL is in danger, independent of their own will. This shield is not as strong as a purpose - created forcefield, however

- Constructs: The primary method of usage. The GL rings can create energy constructs that can easily be larger than planets. These are often used as weapons, restraints, or tools.

- Scan: GL Rings can analyze a target comprehensively, determining its identity, power source, power level, threat level, weaknesses, capabilities, etc. This takes a bit of time to complete, though

Notable OBD Victories:

Beerus (Dragon Ball) - Beerus Profile (this was Hal Jordan)
Black Bolt (Marvel Comics) - Black Bolt Profile (this was Hal Jordan)
Darth Sidious (Star Wars (Legends)) - Darth Sidious Profile (Legends) (this was Hal Jordan)
Supergirl (DC Comics) - Supergirl Profile (this was John Stewart)

Notable OBD Losses:

- The Flash (DC Comics) - Flash Profile


This profile doesn't cover Green Lanterns in other media, such as DCAU, or specific Green Lanterns, or Green Lanterns who derive their power from different sources (such as Alan Scott)

Also, The Green Lantern series, was one of the few DC series that wasn't fully affected by New 52, and with the Rebirth era being now on, most of the DC series slowly go back to their origins, there are combined elements from pre-New 52 and new 52, for plot reasons, for now