Ouroboros (身喰らう蛇, Migurau Hebi?) is a secret society which also the one responsible on all events in the trilogy. The Ouroboros is led by a mysterious figure called The Leader (盟主, Meishu?), under him/her was a skilled agents called Angis (蛇の使徒, Hebi no Shito?), and under the Angisses are Legion (執行者, Shikkousha?). All of them are people with extraordinary skills.
The Master (盟主, Meishu?)
The leader of Ouroboros. Everything about this figure is a complete mystery, as nothing about him/her is known except that he/she holds a weapons made from The Outside Reason.
The First Angis
Only appears during a conversation in the 3rd, this figure seems to be the leader of the Angises,
The Second Angis
Only appears during a conversation in the 3rd, she is a woman under the title The Abyss (深淵, Shinen?), she holds quite a liking towards Leonhardt and calls him Leon.
George Weissman -The Faceless- (白面ゲオルグ・ワイスマン, Hakumen Georugu Waisuman?)
Japanese voice: Tanaka Hideyuki
The Third Angis and chronically the first Angis that appears on the trilogy, he is called "Professor" by his comrades. Not only he is the mastermind behind all events on FC and SC but he is also the one who is responsible for The Tragedy of Harmel which also the reason of why The One Hundred Days War occurred in the first place.
He assumes the identity of Professor Alba (アルバ教授, Aruba Kyojuu?), during FC to complete his plans and also to watch over Estelle and Joshua.
He possesses the power to manipulate people memories and hypnotize which he uses on many people to do his dirty job for him (One of the victim is Joshua and Richard). His wand was granted by The Leader and have the power to control space to attacks.
Because of his actions to fulfill his experiments and plans he was hated by his comrades to the point no one (except The Leader) seems to mourn his death.
Doctor Novartis (ノバルティス博士, Nobarutisu Hakase?)
The Sixth Angis, he was also the head of The Thirteen Factories, the one responsible for Ouroboros robots. One of his creation was Renne's Patel-Matel. A typical mad scientist figure, he only care about his experimentations and little else.
Arianrhod (アリアンロード, Arianroodo?)
The Seventh Angis, only appears during a conversation in the 3rd. Only in the newest installment of the series, Ao no Kiseki is she is revealed to be a beautiful stern looking young woman wearing a full knights armour and wielding a huge lance. She is skilled in every martial arts, possesses a strict moral code and shows no mercy to her enemies, she holds a high expectation for Leonhardt and expecting him to someday surpass her.
She claims to be the legendary "Valkyrie" of the Erebonian empire, who used to lead the Empire's elite cavalry forces into battle, but if true it would mean she had lived for over 200 years. She is one of the most powerful figure in the Ao installment.
She is named after Arianrhod a goddess from Celtic Mythology which means "Silver Wheel".
Campanella -The Fool- (道化師カンパネルラ, Doukeshi Kanpanerura?)
Legion No.0, a young man with a tattoo under his right eye. Although he looks like a normal young man, according to Joshua, even after his days as a Legion Candidate(about 7 years ago) Campanella doesn't seems to change at all raising debate whether he is a human or not. He serves as the watcher for Weissman's plan and ultimately retrieves Weissman's wand and give it back to The Leader.
Leonhardt -The Sword Emperor- (剣帝レオンハルト, Kentei Reonharuto?)
Japanese voice: Hikaru Midorikawa
Legion No.II, known as Löwe (レーヴェ, Reeve?) among his friends. Joshua and Karin's childhood friend, and also a brother figure for Joshua. He once was a young man with a dream of becoming a Bracers. After The Tragedy of Harmel, he was the one that takes care the broken Joshua until Weissman comes and offers him to restore his heart in exchange for their services in Ouroboros. The Tragedy of Harmel has greatly changed his views in humanity, he starts to think that humans are a weak creatures that only seeks the truth that pleases them and abandons all sad truth in the pasts, so he chose to cooperate in Weissman's plan so he can see the true extent of the potential of humans. After the fight against Joshua he came up with the answer "Even though humans are weak, together they are a strong beings". After granted the answer he chooses to stop Weissman's plan at the cost of his life. After entrusting Joshua to Estelle he took his last breath.
Despite all his words about he would kill Joshua if he gets in his way, it is very clear that he always worries about him and feels guilty for not being able to save him, so he feels very grateful for Estelle who has saved him.
Just as his title The Sword Emperor, Leonhardt is an excellent swordsman surpassing even Richard. He can be described as one of the if not the most powerful character in Sora no Kiseki trilogy matched only by Cassius Bright. According to the Fifth Angis he may be the only one that can stands a chance against The Seventh Angis.
His sword Kernviter (ケルンバイター, Kernbaitaa?) is also granted by The Leader just like Weissman's wand, it holds the power to cut through anything for it was not made by this world's reason.
Lucciola -The Enchanting Bell- (幻惑の鈴ルシオラ, Genwaku no Suzu Rushiora?)
Japanese voice: Hiromi Nishikawa
Legion No.VI, a woman that uses fans as her weapons. She excels in using a combination of fire and wind Orbment, she also has a power to summons mythical creatures but what makes her a formidable enemy was her skill to creates illusion with her bell.
She was once from the Harvey traveling circus like Scherazard. She is also respected as a sister by Scherazard but she mysteriously disappeared after the circus is disbanded. It's revealed that Luciolla holds a feeling towards the ringmaster but sadly that love was one-sided, after she realizes that the circus is going to be disbanded and she will never see the man he loves again she choose to kill the ringmaster under beliefs that he'd be her forever.
Walter -The Lanky Wolf- (痩せ狼ヴァルター, Yase Ookami Varutaa?)
Japanese voice: Takahiro Yoshimizu
Legion No.VIII a man with a black suit and sunglasses, uses his fists as his weapons. He was once from the martial artist dojo Calm Dip Flow (泰斗流, Taitoryuu?) just like Zin. As a martial artist Walter has tremendous power.
He was Kirika's lover and the expected successor of the dojo, or that was supposed to be the case. The truth is the dojo master and also Kirika's father, Ryuuga decides to give the successor seat to Zin instead. After hearing this, Walter that can't accept this fact asked Ryuuga to let him fight against Zin. But Ryuuga said Zin will just let Walter win unconsciously both in martial arts and woman. Walter starts to go mad and so Ryuuga choose to fight him in place of Zin and ultimately gets killed by his own disciple. Unknown to him Ryuuga was in fact was deadly ill at the time, Ryuuga's intention all along was to teach Walter and Zin the way of life of a martial artist by choosing to die by the hand of his number one disciple, Walter.
Blblanc -The Phantom Thief- (怪盗紳士ブルブラン, Kaitou Shinshi Buruburan?)
Japanese voice: Hiroaki Miura
Legion No.X, a masked man with a white cape often seen with a rose. He was a famous thief from Semuria under the alias "Phantom Thief B". He is obsessed with beauty and saw Kroze as a charming woman, Estelle calls him "The Pervert Mask".
He cooperated with Weissman's plan as to steal "Hope", because he thinks that the faces of those that resist and cling into hopes are beautiful.
He goes to Crossbell in Zero no Kiseki and is part of one subquest where he steals a statue and hides it in the mayor's bedroom.
Joshua Astray -The Black Fang- (漆黒の牙ヨシュア・アストレイ, Shikkoku no Kiba Yoshua Asutorei?)
Japanese voice: Mitsuki Saiga
See Joshua Bright for more details.
Renne -The Angel of Extermination- (殲滅天使レン, Senmetsu Tenshi Ren?)
Japanese voice: Kumiko Nishihara
See Renne for more details.
Read more about this topic: The Legend Of Heroes: Trails In The Sky, Characters