The Undead Unluck manga series features an extensive cast of characters created by .
Main characters Fuuko Izumo
is an 18-year-old girl who teams up with Andy. When she was a child, her Negator ability awakened and she accidentally killed her parents, along with other people, in a plane malfunction. As such, she became severely asocial out of fear of harming others with her ability, and was suicidal until meeting Andy. Her Negator ability, "Unluck" causes whoever touches her skin-to-skin to encounter misfortune ranging from mild to severe based on how long the contact was and the level of affection she harbours to the target. Following the events of the Ragnarok arc, she becomes the new leader of the Union in the 101st loop. She learned to bypass the skin-to-skin and affection level weakness by creating "Bad Bullets", where she places her Unluck into the bullets and shoots it to the target. Once it hits the target, Unluck will make way to the bullet, hitting the target in the process.
Andy
is a suicidal and reckless man who teams up with Fuuko. He is obsessed with finding a way to kill himself and takes an interest in Fuuko for her Unluck ability. His Negator ability "Undead" prevents him from dying and he can use his regenerative abilities to do a multitude of things, such as firing his finger like a bullet. He has a card in his head that, when removed, releases a second personality called Victhor. A running gag is his clothes being destroyed, as he can not regenerate them, but this stopped when he tames the UMA Clothes. However, his crotch still gets exposed at times whether by accident or on purpose by UMA Clothes. It is later revealed that Andy is one of the only people capable of entering the next loop without Ark, as his ability means he does not die even when the world is destroyed.
The Union Juiz d'Arc
is the first seater, hence the leader, as well as the founder of the Union along with Victor. Her Negator ability "Unjustice" allows her to force targets to enact the opposite of their sense of "justice" by looking at them. She has tamed the UMA Move, which is the Union's main mode of transportation. After the Unbelievable arc, she reveals that the world is stuck in a loop and she keeps her memories by using an artifact called the "Ark," and has lived for millions of years accompanied by Victor so that they may finally kill God. Fuuko replaces her as leader of the Union for the final loop, where she is reincarnated as a cheerful child named .
Shen Xiang
is a Chinese martial artist who is very perky, as well as being the second seater. His former Negator ability, "Untruth" allowed him to make his targets do the opposite of what they intended to, so long as he was looking at them with at least one eye and was fond of them. He also carries a "Nyon-Kinko Staff" artifact which can extend and contract long enough to reach space, as well as a rideable cloud named Kinto-Un. After his battle with his master resulted in his death, Mui used an artifact to revive him as a Jiangshi, losing his Negator abilities but keeping his natural martial arts skills.
Mui
is Shen's subordinate. Before the Union's battle with Feng, Shen's master, she was Shen's assistant. Though she has no ability, she makes up for it by using Artifacts and Martial Arts. After Shen's death, "Untruth" was transferred to her.
Tatiana
is a young Russian girl who cares for her teammates greatly. She is the fifth seater. When she gained her Negator ability, her powers accidentally destroyed her home, killing her parents. She was to be sold on the black market, before being saved by Billy. She lives in a spherical robot suit, and her Negator ability "Untouchable" creates an untouchable barrier around her, although she always has a hole open around her mouth to eat through.
Top Bull Sparx
is a short-tempered Brazilian 15-year old. His Negator ability "Unstoppable" grants him super speed if he attempts to slow down once he reaches a certain speed, and his body must undergo a significant change in shape for him to stop, such as suffering a heavy injury. He is the seventh seater, In the past, he was a poor boy who intended to lose a race so his friends could have a better life, however "Unstoppable" was transferred to him when he slowed down, resulting in him killing two of his friends and injuring the other by crashing into them. He joined the Union soon afterwards. In the 101st loop, he avoided his tragedy and joined the Union when he is older.
Isshin Haruka Yamaoka is the sixth seater of the Union and the 13th to bear the name of - the name her family of blacksmiths have carried for generations - which causes her anxiety and fear of not living up to her title. A running gag is that she is too anxious to talk and communicates through signs. She is a large and muscular woman in a large suit of armor. Anything she uses her Negator ability "Unbreakable" on is granted enhanced durability, to the point of becoming indestructible.
Shunkai Yamaoka is the 12th to bear the name of Isshin and the current holder of the Negator ability "Unbreakable" in the 101st loop, who joins Fuuko's Union temporarily, until Haruka comes of age.
Phil Hawkins is a young boy with a body made of artifacts. He is also the fourth seater. His ability is "Unfeel", which negates his senses and emotions, allowing him to use artifacts without suffering their side effects.
Nico Vorgeil
is the Union's top inventor. His Negator ability "Unforgettable" renders him incapable of forgetting any and all information, starting with the death of his wife, when his ability manifested, no matter how minuscule. He is the eighth seater.Thus, his mind is being "crushed by a never-ending stack of information." He fights using levitating, orb-shaped devices called Psycho Pods which he stores his unnecessary memories on and information on fighting styles so he can replicate them. They can also be used as lasers, transportation, and create clones of people based on Nico's memories called "Astral Dolls".
Victor
is the original personality before Andy, and co-founder of the Union along with Juiz. Unlike Andy, he is ruthless and kills without a hint of mercy. He has a better mastery of "Undead". He retains all memories of all the previous loops, as only he is capable of surviving Ragnarok, and has thus lived for billions of years. Victor is in love with Juiz, and seeks to kill her to finally end her suffering. Initially antagonistic towards Fuuko and Andy, he makes peace with them within Andy's psyche, deciding to believe in Juiz's trust in them and see where their determination leads.
Chikara Shigeno
is a recently awakened Negator. He is somewhat cowardly and tends to panic, but will show courage when he needs to. He is the eleventh seater. His ability is "Unmove", which negates the movement of anything he looks at so long as he himself is not moving. Like Fuuko, he accidentally killed his parents when his ability first manifested. In the 101st loop, he is less anxious and does not have issues with trembling. This is thanks to Fuuko's intervention leading to his parents living.
Gina Chamber
is a former member of the Union. She was an elderly woman from Russia who used her ability "Unchange" to allow her to negate any change in inanimate objects, which she used to make herself look younger by using her negator ability to freeze her makeup in place. She fell in love with Andy, but was killed by him so Fuuko could join the Union and died peacefully after Andy kissed her and said she was beautiful, even after her true age was revealed. Her ability manifested when the UMA Heat attacked her village, resulting in her ability freezing the air and killing 40,000 people by suffocation.
Mico Vorgeil
is a scientist employed by the Union where she works as one of Nico Vorgeil's assistants. She is also Nico's daughter, and the second most competent scientist behind him.
Void Volks
is a heavyweight boxing champion and former member of the Union. He has no qualms with murder, and believes that Negators who are not part of the Union are "UMA Freaks". His Negator ability, "Unavoidable" negates his opponent's ability to dodge when he assumes a certain stance before attacking. In the original loop, Andy killed him with his Parts Bullet when Void failed to circumvent his regeneration. He is recruited by Fuuko during the final loop, his tragedy of killing his final opponent in previous loops having been averted by her and his love of boxing invigorated.
Ichico Nemuri is Nico's deceased wife and Mico's mother. She served the Union as both a member of the Roundtable and a member of the science division, where she met Nico. Her Negator ability, "Unsleep," rendered her unable to sleep, which eventually led to her death via exhaustion. In the final loop, she avoids her fate by learning astral projection.
Under Billy Alfred
was originally a member of the Union, but later revealed to be a traitor. His Negator ability was thought to be "Unbelievable," which let him shoot bullets in directions that seemingly would miss his target, but would ricochet in order to hit them. His true Negator ability, "Unfair," negates the fairness of a user having only one ability, granting him the power to copy other abilities as long as the target views him as an enemy. As a result, he has access to several Negator abilities. This is later revealed to be a ruse, as Billy used his betrayal to gain the abilities of the others so they would not have to die fighting God. He is blind but has enhanced hearing as a result. In the 101st loop, the interpretation of his ability changed, and Unfair activates when he acknowledges another's strength.
Rip Tristan
is a member of Under. His Negator ability, "Unrepair", negates the ability to repair any damage he inflicts which remains unless he dies or he deactivates it. He also has the "Blade Runner" artifact, which creates blades when he kicks and allows him to fly. He was killed by Andy, but is resurrected in a younger body through Feng's use of an artifact called "Life is Strange", and is later restored to his true age by Anno Un using the same artifact. He was formerly a surgeon whose ability led to the death of his lover Leila. He and Latla seek the Ark in order to return to the past and save her, putting them at odds with the Union.
Latla Mirah
is Rip's closest friend and a fortune teller. Her Negator ability, "Untrust", negates her previously accurate predictions, which allows her to redirect any offensive attacks and guarantees events. She was killed by Rip after sacrificing herself by telling him to attack Andy.
Feng Kowloon
is a Chinese martial artist who always wears a hood, later revealed to be Shen's old mentor. Obsessed with being the "strongest in all of creation", Feng took on disciples to raise, including Shen and his sister, Mei, but intended kill them so he may get stronger. Feng is responsible for the death of Shen's sister, the catalyst for Shen's quest for strength. Though an old man when he meets Shen, he restores his youth with the artifact "Life is Strange", which he also uses to resurrect Rip. In the 101st loop, it was reveal that he has "Unfade" which prevents him from ageing or dying from old age. As a stipulation to fight Fuuko, he raised Shen and his sister without the intention to kill them this time around.
Creed Deckard
is a Negator who specializes in weaponry. His Negator ability, "Undecrease," allows him to fire weapons and explosives without reloading, though he has to expend the ammo fired for this to work. If his explosives fail to explode, he cannot use them again until they do.
Backs
is a child-like member who wears a bunny costume, hence her nickname "Bunny". Her Negator ability, "Unback", allows her to trap objects in eggs. She herself does not understand her ability.
Tella