Loki is Nakaba's servant. He is half animal and half human. He hates Caesar, and is plotting to assassinate him. He asks Nakaba to go along with it, but she is unsure. He frequently rescues Nakaba from Caesar and cares for her a great deal. He is her personal servant and took care of her since she was young. It is revealed later that Loki is Nakaba's older brother. He also possesses the arcana of time and has been using it from the beginning of the story. Later in the series, Loki demands that Nakaba gives him Senan. Neither Caesar or Nakaba are willing to fight him, so Loki gets his wishes. Nakaba stays in Belquat to rule with Caesar. All the subpersons in Belquat are relocated to Senan, and all the humans in Senan are relocated in Belquat. The subpersons are officially freed from slavery. Nakaba receives a message from Senan that Loki is dead. She also received a note, but passes out before she can read it. In her arcana, all the locked doors are open, and she learns that Loki is actually her older brother. Their mother told Loki to pretend he was Nakaba's servant outside their village because they'd be killed if the fact that they're siblings is discovered. When Nakaba wakes up, she reads the message from Senan. It's a note from Loki saying that he gives Senan to her. When Rito delivers the news of Loki's death, he tells her Loki's cause of death is from the overuse of his arcana.
An easygoing Goddess whose Familia houses the highest-leveled adventurer. A bisexual and shameless flirt, she has set her eyes on Aiz and will destroy anyone who tries to take her away from her. She has been called Loki "No-bits" as despite her looks, she is very flat chested and is jealous of Hestia for her body.
Loki is the God of Tricks. Loki finds that her life is boring as other Gods tend to shrug her pranks off as a minor annoyance, until she discovers Mizuki in the human world.
Loki is the Evil God from Norse Mythology, and the main antagonist in Volume 7 of the Light Novels. He is an arrogant man, who appears to enjoy destruction as he desires to start Ragnarok (the end of the world). (Source: High School DxD Wikia)
In the anime, it is revealed that Maira, a former Pawn, became a Bishop by gaining the ÄRM Vaqua. He is not given a backround in the manga. Maira is a black-cloaked masked man who takes pleasure in engulfing and digesting people with Vaqua. Vaqua is a blue/green slime-like Guardian ÄRM with one eye. Maira is first seen watching the War Game battle between Ginta Toramizu and Garon. During the second round of the War Games, Maira reappears as a fighter for the Chess Pieces. He has the last of the battles in that round, and goes up against Dorothy. Maira is quick to falsely judge Dorothy's power, though he easily destroys one of her weaker Guardians and stalemates another. Dorothy, however, calls back this one to bring about her favorite, Toto, which eats Maira's Vaqua. Maira, now ÄRM-less, begs Dorothy for mercy. Dorothy, however, doesn't do as such and has Toto eat Maira as well, becoming the first casualty of the War Games.
A member of Arc Aile who, like Cisqua, chose to use weapons rather than Edel Raid, Maina is an old friend of Cisqua. She appears in an episode of the anime to bring Ren back to HQ as the main Arc Aile trio uses the disguise of a vacation to help find Edel Garden. It turns out she was controlling a Sting Raid that was attacking people on the ship through song, but in the end Cisqua uses the song against her and has to kill her to prove her dedication to Ren. Cisqua also claims that Maina is the better sniper, but worse at everything else.
Maina is the mother of Moena and part of Angel Blade.