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The Heroes
Ren Homura
- Voiced by: Yūsuke Kobayashi
- Amnesiac Hero: He has no memory of his life in Kaminogahara.
- Breaking the Fourth Wall: Does this on occasion.
- The Hero
- Power Dyes Your Hair: Whenever he activates the app, his hair changes from brown to red.
Aoi Mizusawa
Akira Kagetsuki
- Voiced by: Kengo Kawanishi
- Defrosting Ice King: He refused to accept Ren as Haruma's replacement, because he lacked his traits. After seeing his leadership skills and kindness, he was proven wrong and joins the new team.
- Catchphrase: "Arienai" (Unbelievable or impossible)
- Stoic Spectacles: He wears glasses and is aloof and distant.
- Sugar-and-Ice Personality: He's usually cold and stand-offish, but is caring and will do anything for them.
- Tsundere: He is described as such.
Minami Wakaba
- Voiced by: Juri Kimura
- Genki Girl: Very cheerful, bubbly, and energetic.
- Kind Hearted Simpleton: Acording to Dudolph, she's a kind-hearted girl, despite her air-headed nature.
- Otaku: She loves anime and manga
Oragon
- Voiced by: Jun Fukushima
Mana Livingston
- Voiced by: Hisako Kanemoto
- Eagleland: Downplayed. She at first pretends to speak Japanese with a thick American accent, on the misguided advice of her friend back home. It turns out she speaks Japanese very well with a native-like accent.
- Evil Twin: Miroku pulls out Mana's shadow and uses it to prevent the heroes or anyone else from interfering with her plans. Mana's monster Walpurgis discovers this when she attempts to use Scarlet Dice Sabbath to bind Mana's soul to stop her devastating attacks for a while, and finds out the Mana she used the magic on did not have a soul; she concluded that the real Mana must have been somewhere else, and she was right.
- Half-Human Hybrid: Her father was a monster and her mother a human, but she didn't know this.
- One-Woman Army: Her shadow singlehandedly takes out whole battalions and squadrons of tanks, combat helicopters, and fighter jets, while leveling entire city blocks.
- Red Eyes, Take Warning: Her shadow.
- Token Minority: A white girl from New Jersey, USA, who turns out to be a Demihume (half-monster, half-human).
- Tomato in the Mirror: When she discovers she's a Demihume, she has a very hard go of things.
- Winged Humanoid: In her and her shadow's monster forms.
Madarame Corp.
Minoru Madarame
- Voiced by: Junji Majima
- Big Bad Wannabe: He's trying to find and utilize energy points to get the powers of a monster while remaining human. Unfortunately, for him, his monster Miroku has other plans.
Miroku
- Voiced by: Ayako Kawasumi
- Big Bad: The true villain of the series, who's trying to destroy and recreate the world.
- Creepy Monotone
- Evil Cannot Comprehend Good: She can't understand how hopelessness and sorrow can be overcome by the Power of Friendship.
- Misanthrope Supreme: She likens all humanity, including the people she murders, to bugs and blades of grass; that is how little she values human life.
- Omnicidal Maniac: She wants to end the world and recreate it to prevent things like suffering and hopelessness.
- Physical God
- Shut Up, Hannibal!: She tries to justify imprisoning Mana by saying it's necessary for her plans to recreate humanity. Ren and his monster Ryoma respond saying, they don't care about any of that: They just want to rescue their friend Mana!
- The Starscream: She betrays and murders her master.
- The Unfettered: She is ruthlessly working towards her goals, not caring how many people she murders along the way, as she believes she is saving the world by doing so. Ren's monster Ryoma calls her out on this, saying that someone willing to murder so many people shouldn't even think about trying to save the world.
Other Characters
Haruma Kagutsuchi
- Voiced by: Daisuke Ono
- Brainwashed and Crazy: The reason why he is cold to Ren and his team was because he was under Memento Mori's Control.
Mariko Kobayashi
Shino Ichinose
- Voiced by: Saori Onishi
- Brainwashed and Crazy: She got her memories taken away by Kushinada and is under her control.
- Empty Eyes: Her eyes lack shines in comparition of other characters.
Kaoru Owada
- Walking Shirtless Scene: He wears his jacket left open to expose his naked torso.
Akane Noda
- Fangirl: Of Minamikaze, and she will do anything to give bad publicity to other restaurants.
Decemviri
The main antagonists of the Monster Strike 2018 (ONA). Holy beings that betrayed the Almighty to take over Strike World for themselves. They seem to be connected to the mysterious stakes on the tree for the Almighty's body.
Keter
- Arc Villain: Of Lucifer 1 and Lucifer Wedding Game.
- Back from the Dead: Turns out that a single feather survived his apparent disintegration at the end of Lucifer 1, allowing him to regenerate, and become obsessed with Lucifer.
- Killed Off for Real: Get obliterated by an upgraded Lucifer, with nothing left to regenerate from. His pillar vanishing confirms this.
Binah
- Arc Villain: Of the Angel's side of Lucifer 2, though it turns out to be a misunderstanding.
- Only Sane Man: Turns out that while she sent the two archangels after Gabriel, Raphael, and Michel, she was still for the Almighty, and is the only one that doesn't betray Him.
Chokhmah
- Arc Villain: Of Lucifer's side of Lucifer 2 with Malkuth.
- Cavalry Betrayal: Gets backstabbed by the other members of the Decemviri, and used to power a weapon that destroys his own word.
- Egopolis: Has a planet in the shape of his head. Gets destroyed by the Decemviri's weapon.
Malkuth
- Arc Villain: Of both the Angel's and Lucifer's side of Lucifer 2 with Chokhmah and Solomon.
- Killed Off for Real: Gets hit with his own attack thanks to Solomon and Levy, where it explodes safely in space. His pillar vanishing confirms this.
Tiphereth
- Arc Villain: Of Arthur(2nd).
- Killed Off for Real: Gets Excalibured all the way to Arthur's sun, destroying the disco cover she made and undoing the The Night That Never Ends. Her pillar vanishing confirms this.
- The Night That Never Ends: Thanks to Merlin, she decides to cover Arthur's sun with a disco cover to never be bugged by the sun again.
Chesed
An impish, purple skinned man with a turban that has a tendency to write negative reviews in his book and runs into Pandora and her talk show. When the two of them wind up crashing into Noah's world, he works with him and his AI to escape it.
- Arc Villain: Averted, while he does betray them temporarily, the Adapters are the true main antagonist of Noah.
- Heroic Sacrifice: After being convinced that Noah and other really are his friends, he gives up his magic turban, which actually kept him alive, to resurrect Noah. He fades away after Noah convinces him that he's a better person than he think he is by writing pluses in his book.
Da'at
The eleventh Decemviri, a small, turtle sage with fox tails, who is said to appear when the Heavens are in peril. When found by Lucifer, he'll only help her if she can pass his trial.
- Big Good: Turns out, he's the one who sent Box Guy off to find Orangon and the Heroes.
- Time Stands Still: People will still be conscious so that he can talk to them.
