Sir Jordan, The Emerald Knight.

Sir Harold Jordan (High Commander)
Knight of the Kings/Queens Lantern Corps.
Emerald Knight of the Knights of Justice (Justice League).

The King/Queens Lantern Corps: A specialised fighting force consisting of the realms bravest warriors, tasking with beating back the forces of darkness and more severe threats.

Each Knight possesses a ring and power battery. They typically ride real horses, dragons or hippogriffs; failing this they generate constructs of the aforementioned creatures. Each Knight can generate weapons of their choice made into solid constructs, as well as fly.

The Knights of Justice are a civilian group of noblemen and women  who possess special abilities.

Knight of Steel: Superman.
Lady of Steel: Supergirl
Maiden of Might: Wonderwoman.
Knight of Darkness/The Dark Knight: Batman.
Heir to the Darkest Knight: Robin
The Scarlet Knight: Flash
Knight of the Ocean/Seven Seas: Aquaman.
Knight of Mars: Martian Manhunter.
Knight of Lightning: Captain Marvel/Shazam.
Avian Knights: Hawkman and Hawkwoman
Micro Knight: Atom
Knight of Technology: Cyborg. (Subject to adjustment)