These tools are from the fictitious Japanese manga serie, Majin Tantei Nougami Neuro.
Throughout the series there are some named techniques used by Neuro, and presumably other hell born demons, that are used for just about any purpose. As well, Neuro has access to the seven defense weapons used by the Demon Emperor, something very few demons have access to; these weapons are based around natural occurrences and elements, presumably, in the demon world. Neuro uses most of these to solve mysteries or to punish their culprits. Using these tools depletes Neuro of his demonic energy however. For instance, in chapter 81, after using Evil Aqua, Neuro suddenly spurts out a large amount of blood due to the lack of demonic energy in his body.
Tools of the Demon World
Evil Ampule (Chapter 61)
A needle full of potion that Neuro claims doubles the revolution speed of the neural transmitters in the user's brain, making them more intelligent.
Evil Badger (Chapter 35)
An insect with an unbalanced diet, it replaces the target's tongue and feeds on the victim's most disliked foods. The victim's breathing will stop if the insect ceases eating before it's done.
Evil Blind (Chapter 8) (Anime Episode 5, 19)
Neuro engulfs himself and anyone else of his choice in an aura. This allows Neuro and Co. within a 10 meter radius to shift into a "lower resolution" of existence. Though used for investigation, the method is probably used by other demons for killing, as indicated by Neuro.
Evil Butterfly (Chapter 53) (Anime Episode 12)
A strange little butterfly with human ears for wings which functions as a hidden mike. This is paired with a set of earphones shaped like a human face where the speakers are on the mouth. While this tool seems normal at first, the user actually risks having their head pierced though by the speaker which extends out like a drill when the face sneezes.
Evil Canceller (Chapter 19) (Anime Episode 7)
Neuro regurgitates a liquid (similar to vomit). Anyone it gets on becomes invisible. Though the wearer cannot be seen they may still be heard. It was advised by Neuro that Yako not speak loudly or step too heavily.
Evil Carpenter (Chapter 137)
A giant demonic construction worker with several man-sized workers sprouting from its spine. Neuro uses this tool along with Evil Mud to reconstruct the collapsed places in certain parts of the city.
Evil Centipede (Chapter 94)
A tool that looks like a gigantic centipede made out of shoes. It is used to show how many times a person has stepped in a certain area by replacing their footsteps. The more they have stepped in the area, the darker the footsteps become.
Evil Chainsaw (Chapter 55) (Anime Episode 13)
Neuro's hand metamorphosizes into a miniature chainsaw to cut things, strange enough the tool is actually powered by a small creature running on a hamster wheel on the tip of the blade. In the manga this is not a tool of hell.
Evil Cocoon (Chapter 23)
A tool Neuro uses on Yako to give her a "different aura" around people. What Neuro tells Yako is a lie. It's actually an illusion tool to make it appear as though the user is a grotesque monster-like figure.
Evil Comedy (Anime Episode 3)
Neuro sends a makai bug to land on a person's face where it becomes a pair of demonic glasses that drill into the person's head, making them think they are trapped on a giant spider web covered with bugs. While this is happening the glasses are invisible to everyone except Neuro and the victim who while in the illusion laughs uncontrollably.
Evil Diversey (Chapter 44) (Anime Episode 6)
A demon world battery which is filled with Neuro's demonic energy. It takes on the form of a small triangular hair clip at the end of Neuro's hair and it, among others, decorates Neuro's own hair and seems to be one of the only weapons Neuro doesn't need to summon. When applied to something that needs Demonic energy to survive, such as Akane or Neuro himself, it extends the time needed for that one thing to assimilate more demonic energy. If Neuro lends one to something else that needs Demonic energy, Neuro can influence that being's appearance.
Evil Drop (Chapter 29) (Anime Episode 4)
An eye drop that allows the user to shoot "Makai Beams" from their eyes at can even destroy a building. This tool was only explained and never used so it isn't known if it's power is true or if Neuro was lying about it. IN the anime, this too wasn't even fully explained, it's effects only implied.
Evil Fiction (Anime Episode 11)
=A insectoid accessory which is attached to the ear like an earring to portray someone as a character. However this only works for thirty minutes before the tool itself starts gnawing on the ear, crawling into the host to feast on their organs.
Evil Friday (Chapter 1) (Anime Episode 3)
Neuro spits out a large sphere made of eyeballs. The eyeballs detach and become sentient lifeforms. The eyes function like cameras and serve as extra eyes for Neuro.
Evil Fumble (Chapter 62)
A bottle of potion that is supposed to be an even stronger version of Evil Ampule. Neuro used this to try to make Yako's classes harder by boosting her teachers' brainpower, but instead it hospitalized them (along with thirty students), mainly because the solution was meant solely for use on demons.
Evil Full Face (Chapter 39)
Neuro sends out a demon head from his hair that acts as a smoke screen bomb to allow for quick escapes.
Evil Gauntlet (Chapter 147)
A Mole Creature with a big glove on it's nose will come out of the ground and grab the opponent's legs.
Evil Illusion (Anime Episode 2)
Neuro uses a demonic umbrella to seal himself and his victim off from the rest of the world in another space so he can change and eat their "mystery" while projecting the illusion to anyone watching that nothing strange is happening between.
Evil Insole (Anime Episode 8)
=A creature like a shoe's insole that climbs into the interior bottom of a person's shoe and analyzes all the substance that is present in the shoe, right down to the DNA.
Evil Javelin (Chapter 5) (Anime Episode 1)
Neuro turns his arm into a weapon-like object, and uses it to cut through objects. Nothing is actually being done, but the impact of the slice gives a read out on all the material in whatever was cut.
Evil Lavender (Chapter 118) (Anime Episode 25)
Neuro's hand becomes something that resembles a purple drill, and is used to stab through objects. Once it has punctured the target, it will bloom into lavender flowers; upon closer inspection, the "flowers" are really small, demonic hands curved into the flower shape. It's unknown what other abilities this may have.
Evil Low Beam (Chapter 17)
Neuro creates small lenses on his fingertips which when looked into will burn an image into the victim's retinas so that whenever they open their eyes they will see it.
Evil Pressure (Chapter 119)
Out of Neuro's nape comes out a machine that sends a demonic electrical current that tears apart muscle and tendons.
Evil Rapid (Chapter 79)
A tool that is a demonic conceptualization of a steam train, it can reach mach speed in one second, with the G-forces tearing up a human body in the process. Neuro only mentions it but never actually uses it in the chapter.
Evil Reflector (Chapter 73) (Anime Episode 17)
A microphone-like device when activated opens a women's head within a mirror shell, then hexagonal mirror discs begin floating all around Neuro. Anything that flies towards the discs will be reflected back in the opposite direction with same force and same speed.
Neuro removes his glove and his hand becomes cybernetic. He can use this cybernetic hand to reach into objects like computers and retrieve information physically by grasping it. In the anime, this may not be a tool of hell as Neuro doesn't seem to announce it.
Evil Stalker (Chapter 10)
An insect that Neuro uses to keep track of people. Functions as a tracking device.
Evil Station (Chapter 49)
Not really a tool but more a game system from the underworld that projects "solid images" (you can feel them but they are really not there) making the game 3D for the player. If turned off too quickly, some residual images may remain.
Evil Sticker (Chapter 37)
A small sticker that is placed on a fingertip, the closer the user is to their objective the stronger the finger will stick up. Neuro placed it on Yako's middle finger when she went looking for Godai.
Evil Stringer (Chapter 13, 131) (Anime Episode 9)
A figure with a drill on the bottom that punches a hole into the head of a victim. It is then transformed into a "Bat" with a thin bass without strings, so instead it uses the nerves that drilled out from the victims head to play. Once tightly stung, with its wings the bat then plays screechy music directly into the victims head. This process of torture however, cannot be seen by bystanders.
Evil Stole (Chapter 152)
An Item Neuro Brought in case his demonic energy was so low it was a matter of life or death. It Resembles something like a Scarf and long Sleeve shirt. If Neuro wears it for a long time, it'll scrap together the bits of Demonic energy in the air and give it to neuro. But if he moves from the spot he's in, it'll shatter.
Evil Surfacer (Chapter 151)
A Ball-like Creature with arms and legs that's drinking a bottle of alcohol. The gas it emits will coat an object and preserve it.
Evil Surrounder (Chapter 79) (Anime Episode 17)
A capsule ball which breaks into little seeds. When the seeds attach to a surface, a plant from hell that feeds on metal will grow instantly to protect its territory.
Evil Taster (Chapter 132)
A demonic tongue-cover that switches the wearer's taste around, making sour foods taste sweet, bitter foods taste spicy, and vice-versa.
Evil Torture (Chapter 138)
A weapon that resembles a set of wings that attach to Neuro. It has no special powers, but it is able to sense what the user (Neuro) wants to do most, and acts accordingly, it's wings acting with a great amount of dexterity in order to follow such desires.
Evil Window (Anime Episode 15)
Neuro summons a demonic window in the sky that when opened will release a beast from hell.
Tools of the Demon Emperor
Evil Aqua (Chapter 81) (Anime Episode 18, 25) Neuro summons a giant laser cannon with six smaller support cannons (three on each side) and fires them at his enemies. The formation of these cannons gives the weapon a serpentine appearance. Neuro implies that the weapons of the demon emperor seems weaker in the upperworld. Whether or not this is because the weapons are less effective on Earth or because Neuro is becoming weaker is not known. This cannon can also swallow up Neuro and a select number of passengers to safely carry out of dangerous locations.
Evil Mud (Chapter 137)
Neuro summons a Golem of mud with the power to easily destroy a city. Neuro uses this tool along with Evil Carpenter to dismantle the Golem into its components to seal the collapsed places caused by a water stream.
Evil Tree (Chapter 96) (Anime Episode 20)
This weapon travels underground to a specified target where it will emerge. It destroys whatever its in its "growing" area. It is seen with a large green bud in the center with about 12-13 long monstrous heads emerging from the base of the plant.