The Hero Faction (英雄派 Eiyū-ha) was the second-largest faction of the Khaos Brigade led by Cao Cao, the descendant of Cao Cao from the Chinese novel Romance of the Three Kingdoms and the one who betrayed Ophis.
The motto of the Hero Faction was to fight and defeat "evil beings" such as Devils, Fallen Angels, and Dragons that bring harm to Humans. The Hero Faction possessed a large number of Sacred Gear wielders who were either abducted and brainwashed, or followed willingly. Many of these members, however, were sacrificed in battle during the Hero Faction's attempts to force them to achieve Balance Breaker. All of those who didn't reach Balance Breaker were eventually captured and later died as a result of Ophis' snakes destroying their Sacred Gears, while those who did achieve Balance Breaker were called back before they could be caught.
The Hero Faction went inactive after Volume 12 after the loss of their leaders. Indra sends their most powerful members (Cao Cao, Leonardo, and Georg) to the Realm of the Dead, taking all of their Longinus from them. Jeanne and Heracles were captured by the Devils and Fallen Angels for interrogation, while Siegfried was the only main member of the Hero Faction who died in battle.
|Cao Cao||The descendant of Cao Cao and possessor of the True Longinus.|
|Georg||The descendant of Johann Georg Faust, the human who contracted with the legendary Devil Mephisto Pheles.|
|Siegfried||The Artificial Human created from the genes of the Dragon-slaying hero Siegfried in the Nibelungenlied.|
|Jeanne||The inheritor of the spirit of the Maiden of Orléans, Joan of Arc.|
|Heracles||The inheritor of the spirit of the Greek mythological hero, Heracles.|
|Leonardo||The possessor of Annihilation Maker.|
|Guan Yu||A general who served under Liu Bei who became a deity of Mt Meru under Indra. He is the supervisor of Cao Cao's team in the Rating Game World Tournament.|
|Perseus||He is the inheritor of the soul of the demigod Perseus. He possesses the Sacred Gear Aegis Mineralization, which has the ability to petrify people who are weaker than him. He wields a sword and a shield.|
The inheritor of the soul of Connla, the son of the Irish mythological hero Cú Chulainn. He possesses the Sacred Gear Night Reflection. He first appeared in Volume 7 combating the Gremory Team. While he lost to Issei, his frustration on losing allowed him to achieve his Balance Breaker, Night Reflection Death Cross, and he was teleported away by the Hero Faction before he could be captured by the Gremory Team. He reappears in Volume 9 where he faces off against Issei in a rematch but losses again due to his overconfidence, indirectly revealing the weakness of his Balance Breaker.
The descendant of Marsilio Ficino. He possesses the Sacred Gear, Dreamlike Curse, and its Balance Breaker, Palaselene Utopia, which has the ability to send a targeted individual into a barrier space of his creation (a seemingly parallel world). He attempted to mentally corner Rias using this ability but was ultimately foiled by Issei and was captured while losing the ability to enter Balance Breaker.
He was later released along with the other members of the Hero Faction and rejoins Cao Cao as his team member in the Azazel Cup,
|Flame Shake Possessor||An unnamed former member of the Hero Faction. He first appeared in Volume 7 fighting the Gremory Team. His Sacred Gear grants him the ability to use pyrokinetic abilities, conjuring white colored flames. He battled against Issei and lost because of Issei's resistance to ordinary fire.|
|Staring Blue Possessor||An unnamed former member of the Hero Faction. He appeared in Volume 7 fighting the Gremory Group. He could use attacks made of bows and arrows of blue light, the arrows shot also able to change direction in mid-air. Being a light attributed Sacred Gear, this weapon is naturally deadly to Devils. He was defeated by Yuuto Kiba.|
|Staring Green Possessor||An unnamed member of the Hero Faction. He appeared in Volume 7 fighting the Gremory Team. His attacks were similar to the Staring Blue Possessor except his abilities were made of bows and arrows of green light. He was defeated afterwards by Xenovia Quarta.|
|Arthur Pendragon||The descendant of King Arthur, the legendary king who wielded Excalibur and the witch Morgan Le Fay.|
|Le Fay Pendragon||The descendant of King Arthur, the legendary king who wielded Excalibur and the witch Morgan Le Fay.|
- Practically almost every Hero Faction member shown wears matching uniforms similar to that of a Japanese school uniform (more specifically, the gakuran worn in the fall).