Sōsuke Aizen (藍染 惣右介 Aizen Sōsuke^?) is the captain of the 5th Division when first introduced, but then he betrays Soul Society and becomes the main antagonist of the series. His former lieutenant is Momo Hinamori. Aizen is a soft-spoken intellectual, accented by glasses during his time as a Soul Reaper captain. While he appears to be very kind to his subordinates, he cares very little for them in truth. According to Aizen himself, he is not bound by morals and will therefore stop at nothing to further his ambitions, including manipulating or killing anyone if he deems it necessary. Aizen is an extremely potent combatant, well above most captain-level Soul Reapers. He goes on to state that the only way for him to advance beyond that would be to gain and master hollow powers. His mastery of the regular skills are such that he is able to stop fully released zanpakutō, includingIchigo Kurosaki's bankai, with one finger, and he can defeat several captain-level opponents at once. A hint to his actual level of spirit power is given when he turns Wonderweiss Margera into an arrancar. When preparing to activate the Hōgyoku, he states that despite its half-awakened state, it can be fully activated when temporarily fusing with someone with twice as much spirit power as a captain-level Soul Reaper, referring to himself. The force of Aizen's spiritual pressure is also great enough to bring the 6th Espada, Grimmjow Jeagerjaques, to his knees without any visible effort from Aizen himself.

Aizen's zanpakutō is Kyōka Suigetsu (鏡花水月^?, literally "mirror flower water moon"). In its sealed form, it looks like a normal katana. Its shikai is both activated and deactivated with the command "shatter" (砕けろ kudakero^?). The phrase kyōka suigetsu suggests its illusory properties; the moon reflected in water and a flower in a mirror are things that can be seen but not held. It is a Chinese idiom for seeing and desiring something that is a dream that cannot be easily grasped in hand, teaching people about temptations.

Kyōka Suigetsu's shikai has the ability to place anyone who sees it under a state of "Perfect Hypnosis" (完全催眠 kanzen saimin^?), after which Aizen can make them see, hear, and feel whatever he wants. According to Aizen, the hypnosis is unbreakable, even if the target is aware that they are hypnotized. The only way to avoid the effect is to not see Kyōka Suigetsu's shikai, making the blind Kaname Tōsen immune to its effects. The effect seems to be permanent, or at the very least long-lasting, as Aizen uses it on nearly all of the lieutenants and captains in the Gotei 13 during a ceremonial release of his zanpakutō years before faking his own death. While the illusions Kyōka Suigetsu creates are quite powerful, they are not 100% accurate; Captain Retsu Unohana was able to realize that something was amiss with Aizen's fake corpse, even though she did not realize what until seeing Aizen alive.

Kyōka Suigetsu's hypnotic abilities make it a useful tool in combat as well, as Aizen can quickly create simple illusions to deceive opponents. By creating a decoy of himself, Aizen can hide his own movements and attack with impunity; his opponent, meanwhile, will remain focused on the illusion until it's too late to react. The most prominent example of this is his brief fight against Sajin Komamura, where an illusionary copy of Aizen is seen melting away after the real Aizen has moved close enough to use the devastating Black Coffin kido.

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Doraemon (ドラえもん^?) is the titular robotic cat sent back in time by Sewashi to aid Nobita. He possesses a fourth-dimensional pocket from which he can acquire various kinds of futuristic tools, gadgets, and playthings from a future department store. Doraemon originally had ears but they were bitten off by a robotic mouse in the 22nd century. As a result, he developed a morbid fear of mice despite being a robotic cat. He also has the tendency to panic during emergencies, characterized by him frantically trying to pull out a very much-needed tool from his pocket, only to produce a huge assortment of unrelated household items.

Doraemon's physical appearance changed as the manga progressed. At first, he was predominantly blue, with a blue tail, a white stomach, and flesh-coloured hands and feet. He also stooped, and had a body much larger than his head. In later issues, he sported a smaller body, white hands and feet, and a red tail--the appearance most identify him with today.

In "The Doraemons" story arc, it is revealed that Doraemon's original paint color was yellow. After getting his ears gnawed off by a robot mouse, he slipped into depression on top of a tower, where he drank a potion labeled "sadness". As he wept, the yellow color washed off and his voice changed due to the potion.

Doraemon weighs 129.3 kg (285 lbs) and measures at 129.3 cm (4'3") tall. He is able to run at 129.3 km/h (80.3 mph) when scared and jump 129.3 m (424.2 ft) when threatened. His maximum power is 129.3 bhp. His wrist, head, and chest circumference are all 129.3 cm. His feet is 129.3 mm in diameter. He is manufactured on September 3, 2112 (12/9/3), at the Matsushiba Robot Factory (マツシバロボット工場^?). Doraemon is considered a substandard product because many of his robotic features (ie. radar whiskers and cat-calling bell) malfunctioned after production. One can turn off Doraemon by pulling his balloon tail.

Doraemon's favourite food is dorayaki (どら焼き^?), a Japanese treat filled with red bean paste. Speculations led to dorayaki being the origin of his name. However, it was revealed in one of the manga chapters that his name originates from the Japanese word nora neko (のら猫^?) for "stray cat", and the -emon (衛門^?) ending which is part of traditional Japanese names, as seen also in, for example, Ishikawa Goemon.

In the 2007 birthday episode, 'MS-903' is used to call Doraemon by the factory owner where Doraemon is produced.

Doraemon usually uses the phrase "nanoda".

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Nobita Nobi (野比 のび太 Nobi Nobita?) is the main character of the series and the center of the story. He is a fourth grader in Tokyo's Nerima Ward and an only child. He wears glasses, a red or yellow polo shirt with a white collar, and blue shorts. Nobita's character flaws are endless: he is lazy, uncoordinated, dim-witted, frail, plain-looking, unlucky, and bad at sports. Nobita's typical day consists of arriving late on classes, scoring zeros in his tests, getting lectured by his teacher, being bullied by his classmates Gian and Suneo, falling into curbside rain gutters, being chased by dogs, and getting scolded by his mom for his sloth and poor academic results.
Despite his flaws, Nobita possesses some unique talents such as his unrivaled marksmanship and ability to weave intricate string figures. Although Nobita is usually portrayed as being cowardly, he has often risked his life to help save others or even entire civilizations (as seen in full-length stories). He has a tendency of acquiring a grade of zero every once out of five tests and has only scored perfect once in his lifetime.

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Shizuka Minamoto (源 静香 Minamoto Shizuka?) usually called Shizu-chan (静ちゃん?) or Shizuka-chan (静香ちゃん?), is the smart, kind, and pretty neighborhood girl who is the object of Nobita's affections. She takes baths several times a day. Nobita often disrupts her in the bath due to some misuse of Doraemon's gadgets, resulting in Nobita's head getting dunked. She is also known for taking piano lessons unwillingly, which is sometimes used as an excuse for declining to hang out with Nobita. Her true passions are sweet potatoes, which she'd rather keep to herself out of the knowledge of others, and the violin, in which her playing is as atrocious as Gian's singing. Due to Doraemon's intervention, Shizuka will become Nobita's wife in the future timeline.

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