Green Lantern/John Stewart

Strategy
Green Lantern John Stewart is a life saver with his passive, shielding characters at critical health so they can get a few free uninterrupted blows and/or allow them to use healing gear.

His passive grants Invulnerability, a very rare form of status effect only shared by the Militarized Batmobile and Superman/Injustice 2's passive, which negates most damage (basic attacks, special attacks AND even Supermove) and status effects on the affected character, including flinching, allowing you to get unblocked  specials much easier. On the other hand, if a character on the team that was using John Stewart's passive, and an opponent that can deal Area Effect (either as according to their passive  and by using other gears), that character won't take any damage, but their teammates will take the Area Effect damage as normal.

However, his poor base stats and the short lived nature of his passive (as well as the fact that it could be bypassed entirely by high hits) makes him rather unpopular.

Red Lantern Hal Jordan's release caused him to briefly resurface, as Emergency Barrier used to be able to shield Hal from his self-damage and allows him to use at least one more special or super. However, this was soon removed and now his passive does not affect Hal's self-damage.

If the first hit (the stun) of Batgirl's Art of Deception triggers his invulnerability, the character will continue to be stunned even when invulnerable.

Good with

 * Solomon Grundy/Regime And Solomon Grundy/Prime: When Grundy's health first falls between 1% and 20% remaining (either before or after resurrection), John Stewart's passive will render him temporarily invulnerable. This can act as a second chance/life saver for Grundy.
 * Doomsday/Containment: Simular to above.

Abilities
Here are Green Lantern's abilities.

Support Cards and Gear
Here are Green Lantern's support cards and gear.