The Index is a simple mechanical construct that acts as the physical embodiment of the table of contents belonging to the Book of Eibon. espite being of artificial fabrication, the Index still possesses a distinct and slightly eccentric personality, this often surfaces in his tendency to reply with the nonsense word "takonimo"*, when answering in the affirmative. Although he acts more like a passive observer to people entering the Book of Eibon, he seems to show some interest in people that likes books, as shown when he inquisitively asks Maka what type of book she likes. He dutifully fulfils his role as an index of the Book of Eibon, guiding the team of Spartoi through the Book of Eibon. The Index has a vaguely humanoid resemblance in regards to it's general shape but it is here that such similarities end. It's mechanized face comprises of a single curved triangular plate, attached to a substantially large cog, with the more commonly observed facial features being replaced instead by emotionally devoid simplistic swirl patternings. The remainder of the Index's body is concealed under a literal shroud, embellished with various words and a repeating pattern composed from squares and circles, except for the multiple small protrusions that act as it's fingers. To better function in it's role as a personification of the Book of Eibon's content page; the Index has an extensive knowledge of the book's current contents and, the specific individualities and express nature of each unique chapter that comprise the fundamental structure of the book, even in regards to the particular consequences one may face by entering them. The Index also exhibits the capability to exert a limited control over the interior realm in which it inhabits, most likely due to it's position and role as a rudimentary element of the book that contains it. The full extent of these abilities has yet to be observed but the Index has been displayed generating portals that can easily transfer multiple subjects from one segment of the book to another, although it should be noted that one can not simply "skim" to the final chapter and must instead grapple with the contents of the other chapters so as to progress in a linear manner to their concluding destination. Naturally, like many others, the Index cannot stand Excalibur to the extent that a grimace even appears in the center of his normally featureless face when in the presence of the Holy Sword. As an inhabitant of the book originally belonging to Eibon, there is a suggested but not stated strong connection between the two, as creator and creation. It was revealed that The Index is the book's intelligence was responsible for Noah's actions and his creator.He wants to collect the Kishin so he can teach the world about Eibon and his madness.This makes him the true Third Antagonist. * This word is derived from "Ikanimo", which is a way of saying "indeed" in Japanese but the word "ika" also means "squid". However, the Index incorrectly states the first syllable as tako ("octopus") instead of ika ("squid") resulting in the nonsense word, "takonimo", that it often uses. The Index bears some resemblance to a strange creature observed standing upon the shoulder of one of the Eight Powerful Warriors, seen in Chapter 16.
Asura's weapon. It was devoured by it's own master, Asura, after becoming a Kishin.
Otama Jackson is a gigantic black tadpole with googly eyes, a long tail and a wide red-lipped mouth bearing a set of sharp teeth. He is a very loyal and hard-working familiar, always doing his best to serve Eruka, even if it means putting himself in harm's way. His main function is to act as a mount for Eruka, using his large size and capability to fly to aid his master in whatever way possible. However, Otama Jackson has very low stamina, and cannot fight at all, making him easily exhausted and extremely vulnerable to attack. Unlike other Witches with their familiars the two seem to share a close friendship with each other despite Eruka's apparent dominant role in the relationship, with even the normally docile Eruka reprimanding Free after he only slightly injures Jackson. Jackson in turn is extremely loyal to Eruka, going so far as to help pass her the needle of Black Blood that is supposed to reawaken Asura before Black Star can get at it, resulting in the tadpole getting beaten up by Black Star. Eruka laments over this, and decides to fulfill the mission solely for Jackson's sake.
The Succubus is a demon who has adopted a female form in order to seduce men so as to absorb their life energy. She currently resides in the first chapter (Lust) of the Book of Eibon, after an unsuccessful confrontation with Noah resulted in both her permanent imprisonment and addition to his collection. In a further attempt to attract men in addition to her rampantly seductive appearance, the Succubus conducts her movements in the most perverted way to expertly accentuate the most bewitching and attractive aspects of her female form. Befitting her need to entice men in order to fulfill her respective desires and vice, this particular demon has assumed an alluring form that she believes best caters to a typical man's wants: A young and voluptuous female with an ample bust. Her softened facial features are contrasted by the stark addition of a vertical line descending from either of her eyes (Which are shown with heart shaped pupils); these lines are connected by a horizontal line that runs over the bridge of her nose, together creating an "H"-shaped marking. The rest of her face is concealed beneath a layered and spiky hood, featuring two prominent horns protruding from the sides. Further placing emphasis on her seductive qualities, the Succubus wears the bare minimum of clothing; consisting simply of skintight gloves and stockings decorated with "H"-shaped accents at their openings and a revealing apron that exposes the majority of her back, except for where a few small strands keep it attached to her body. This wardrobe choice's open back also prominenty displays a "certain aspect" of her appearance. A small, slightly coiled devil-like tail extends from just below the small of her back. The numerous "H"s on the Succubus' person are most likely a reference to the Japanese word ecchi, denoting sexually explicit material or behavior; "ecchi" is a spelling-out of the Japanese pronunciation of the letter H, and could have originated as a polite codeword for hentai in the 1960's.
Wes Evans (ウェス・エヴァンス, Wesu Evansu) is Soul's brother and was the first one to find out about Soul's weapon abilities. He is said to be a master at the violin. Soul feels that he can never be like his brother because he does not know what he is 'capable of'. In the manga, Wes and Soul look exactly alike except for the age difference and how Wes's hair is more tamed than Soul's. (Source: Soul Eater Wikia)
The shy and easily frightened computer expert of the crew, Pony gets along much better with artificial intelligences than she does with any of the organic crew members. Her closest friends are Catty and the ship's computer, OX-11.