Twin Polar Angel (双極天使Sōkyoku Tenshi) is a group of two high-ranked Angels in the White World.
Z/X Encyclopedia Entry
The title taken by Michael and Gabriel (previously Twelve Apostles - Capricorn Hanael), who stands as the highest-ranked Angel in the White World during the absence of Four Archangels - Uriel.
Although Gabriel has inherited the spirit of "radical faction"—who triumphed over the future of White World where the weak was eliminated—from her predecessor, she also shows compromise with the "moderate faction" of Michael who detest the sin-haters, the White World is seeking the path to harmony.
