Character sheets for various characters in Needless here. Potential spoilers ahead, you have been warned.
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The only successful result of an experiment by the Japanese government and the 666 Committee to create a clone of "The Second." Spends his time hiding out in a church, wearing the jacket of a priest even though he has no knowledge of the bible, the priesthood, or anything outside of fighting really. His only weakness is his admitted love of little girls. Adam Blade has the Zero Fragment, which gives him the ability to memorize any power he is hit with and then use it on his own.
Ax-Crazy: Oh god yes. He'd easily be the villain too based on his fights.
Adam Blade's only real friend in this world and terrible with remembering anyone else's name. Eve has the "Doppelganger" ability, which allows her to morph her body into any shape or form. She can heal herself and others from most damage and impersonate other people, but this power is offset by a constant need for calories to balance the drain this power puts on her body. In reality, she is the younger sister of Gido's assitant Kasumi. She was made part of the Eva Project in order to ensure her survival as she would have died by the Age of ten if she didn't. After a accident that would slowly kill Kasumi, her sister gave half of her brain to her while Blade gave a part of his to her later.
Badass in Distress: Got this on her three times; once in the past when she melted and became just a brain, another time during the Simeon Arc (which actually caused the heroes to go there in the first place), and one more when she began to melt again and had to get Eden's Seed injected into her.
The only survivor of the short lived Resistance movement in the Black Spot, Cruz is a normal person who lacks any Needless ability. So he makes up for it by talking to and analyzing other Needless. His ability as a Needless allows to repel any attack with his hand and is named Shield of Aegis.
ForeShadowing: In order: he stopped his sister from killing him (not Arclight's orders), the PF Zero Blast was stated to have the power to kill anyone not a Needless that was caught in the blast, he stopped a Testament without even touching it, blocked deadly rain, and time after time he not only stayed away from any near death status, save for one time, but he had somehow survived any attack meant to kill him, like Setsuna's slap that should've broken his neck twice.
Panty Shot: Started getting these after corss-dressing and was racking up as much points as the Pretty Girl Squad.
Only Sane Man: Up until the Eve's Story Arc, where Saten and he pass this back and forth.
A scientist who worked on the project that ended up creating Adam Blade and Adam Arclight, he generally tags along with the group and tries to care for Adam Blade but usually gets shoved into the background. However, he reveals that he is in fact the leader of the 666 committee.
Power at a Price: The price of activating his Adam power is that his body will eventually fall apart. Hasn't happened yet though.
The hot-blooded needless with the ability to create and toss large balls of fire at his opponents. He bears a grudge against Adam Arclight, but accidentally gets into fights with Adam Blade over a case of mistaken identity.
A God Am I: Teruyama is very prideful of his abilities, but never claims he's anything close to a god. Played straight with his clone, however.
Greed: Big time, yet downplayed. Her dream is to be rich, and the only reason she met Kana was because she was promised money. Even then though, she barely mentions being greedy during her appearances, and you'd only know this if you read Chapter 0.
Shinigami: Subverted. She is actually playing that role base from her powers itself.
Another little girl and comrade of Adam Blade who dreams of being an Evil Overlord of Black Spot one day. Her Needless ability is "Magnetic World," which can be used to attract or repel objects and people alike.
The Evil Counterpart of Adam Blade, who was considered the last failure of the same project that produced Adam Blade. Even though he carries the same ability to absorb any other Needless ability in the vicinity, Arclight's body has been decaying due to a genetic defect. So he has taken control of the pharmaceutical company Simeon in Black Spot to find a way to keep his body from literally falling apart.
Anti-Villain: Surprisingly enough, while he is by no means a heroic person and does many cruel things he does want to ensure the survival of the human race by evolving as many as he can to prepare for the eventually Angel Invasion.
Big Bad: Though there's a Bigger Bad in the form of the organization assisting him, Arclight's the main focus.
Body Horror: Far too frequently, from originally being wrinkled and skinless to being to produce tentacles that look like organs.
A Needless with the power of "psychokinesis" who was a gang leader somewhere in Black Spot until she was defeated by Arclight. Since that day, she has become fanatically devoted to him. She also leads Simeon's "Pretty Girl Squad." One of Simeon's "Elite Four."
Retcon: Though that doesn't explain how, in a bonus chapter, she was a normal, though powerful, Needless who had a cult following and never even heard of Arclight before he found her.
Super Power Lottery: Her power makes it impossible for any of Team Blade except Cruz to fight her.
Vapor Wear: In not one of her costumes does she seem to wear underwear.
Saten / Real Adam Arclight
A Needless with the power of the "Fourth Wave," or the ability to suck up heat from his surrounding area and then unleash it in a focused blast from his arms. Technically one of Simeon's "Elite Four," though he has been hiding information from Arclight for his own secret reasons.
Anti-Hero: He's still on the side of Simeon, but he's shown he's not that bad a guy. He held back against Eve, allowed her to knock him out and heal her dying friends, and without his help, the Eve Story Arc probably would've ended with either Cruz or Blade dying.
Badass: His true power is so great that Blade isn't even capable of using it to its full potential.
A little boy who's obsessed with magic. His Fragment is "Bermuda Athport", which allows him to turn things invisible. Another of Simeon's "Elite Four", though the title "Uten" is actually passed down from person to person,
Axe Crazy: His clone is really unhinged since getting a stigmata.
Disc One Final Boss: In the anime, he's the first of Simeon's Shitennou they faced and had a power that essentially made him a Puzzle Boss compared to the more direct combat applications of the other three's fragments.
Cruz's older sister who sacrificed herself to save him from a Testament robot at the beginning of the story. Later turns out to be a ruse. She's a Needless with the power of "Fire God's Breath" who can affect people, objects, and even other Needless powers at the subatomic level, and she's not above killing her own brother to complete her mission. The last of Simeon's "Elite Four."
Vapor Wear: Currently, her underwear is not only her pants, but apparently has a gaping hole in the most important spot.
Pretty Girl Squad
The Quirky Miniboss Squad. They are three students who follow Riru directly, and are in charge of getting Blade's body to Arclight so he may survive. There's more like an entire army of "Pretty Girl Squad" members, but we see the most action from these three.
One of the recurring characters from Simeon's "Pretty Girl Squad." She carries around a deceptively-heavy teddy bear and has the Needless power of "Power". Just like it sounds, she has the power of super-strength.
Children Are Cruel: She acts like and seems to be a little child, but in the manga, she eviscerated a fellow girl squad member because she started a fight.
A girl who never speaks except to bring out her ultimate attack (her name literally means "no mouth"), Kuchinashi uses a fan strapped to her wrist for her Needless ability of "Fragrance," which can paralyze opponents or even partially control their bodies. She communicates her thoughts with a sketchpad and a sharpie that she pulls out of hammerspace.
Cute Mute: Though she can speak, she prefers not to.
Lotus-Eater Machine: Her ultimate attack, which allows people to see their greatest and/or happiest dream. Eve dreamed of correctly guessing everyone's name, Cruz dreamed of seeing his (nicer) sister, Teruyama dreamed of defeating both Blade and Arclight, Gido dreamed of seeing his long-lost assistant who he loved, Seto dreamed of being rich, and Solva dreamed of ruling the world. Disc wasn't affected due to being a Cyborg, and Blade "already was in paradise".