Illumi Zoldik

Silva Zoldyck is Illumi's father and the current head of the family.
A powerful Nen user (Emitter type).
Possesses immense physical strength: capable of killing the leader of the Chimera Ants with a single blow.
Cold and ruthless, but to some extent, he cares for his family.
She is tolerant of Killua's decisions, hoping that he will return home on his own.

Kikyo Zoldyck is Illumi's mother.
Born in Meteor City, she likely started out as a servant before marrying Silva.
She is cruel and has fully embraced the Zoldyck family philosophy.
She participates in the children's harsh training.
She especially favors her younger sons, Kalluto and Killua.
She disdains Milluki and disregards Alluka.

Milluki Zoldyck is the second-eldest son and Illumi's younger brother.
Not a fighter: prefers remote assassination methods.
A technical genius and hacker, he creates weapons to fulfill contracts.
An otaku, he rarely leaves his room.
He hates Killua and sometimes torments him, but this is more of a form of bullying within the family.
Killua Zoldyck is the third son and younger brother of Illumi (one of the main characters in the manga).
He demonstrated outstanding potential as an assassin from childhood (he was sent to the Heavenly Arena at the age of six).
Illumi tries to control him: he implanted a "self-preservation needle" into Killua's brain, forcing him to avoid dangerous battles.
Killua does not want to inherit the family business, striving for freedom and friendship. Alluka Zoldyck is the younger brother.
Her body is inhabited by an entity named Nanika with the power to grant wishes (but with dire consequences).
Her parents isolated Alluka in the basement, rejecting her.
The only person who treats her with love and care is Killua; Alluka reciprocates his feelings.
Illumi is interested in controlling Alluka's powers. Kalluto Zoldyck is the younger brother.
He loves his mother and envies Alluka. Often teams up with Illumi on missions.
One of the few who supports Illumi in

Weaknesses
Despite their power, Illumi's abilities have limitations:

Needle dependence. Without them, long-term transformations are impossible.
Duration. Temporary appearance changes disappear after 5 hours.
Nen resistance. Experienced Nen users can resist his influence or detect the needles before they activate.
Physical damage. Although Illumi is durable, he is vulnerable to powerful direct attacks.

1. Needles and Pins

Illumi's primary weapon. He carries them in special holders on his clothing.

Characteristics:

Material: Usually a silver rod with a yellow handle and a round head.
Purpose:
Altering appearance (one's own or another's);
Instilling commands into the subconscious (e.g., "avoid mortal threats");
Temporarily enhancing or suppressing the victim's abilities;
Recording body transformations.
Method of use: The needles are inserted into the skin or deeper (into the brain). The depth and location of insertion influence the effect.
Hidden Weapons

,Illumi can conceal additional needles in his hair or clothing, using them for surprise attacks.

3. Transformed Weapons

Thanks to his body-altering abilities, Illumi sometimes transforms parts of his anatomy into weapons:

sharp bone spikes;
reinforced claws;
elongated fingers that act like darts.

Nen (Manipulation)

Illumi is a Nen master, specializing in Manipulation. This allows him to control the actions of other beings, both living and non-living.

Key features of his Nen:

Self-Preservation Needle. Illumi can implant a special needle into a person's brain (as he did with Killua, for example). The needle causes the victim to instinctively avoid life-threatening situations, even if they are willing to take the risk. The effect lasts for a long time.
Body Control. Using needles, Illumi can alter his own body: transforming his facial features, voice, and musculature. With special pins, the changes are permanent; without them, the effect lasts for about five hours (his eyes remain unchanged).
Suggestion. Illumi can mentally command others, forcing them to perform specific actions. To do this, he often uses needles as "transmitters" of commands.

Physical Abilities

Superhuman Endurance. As a member of the Zoldyck family, Illumi possesses a high tolerance for pain and injury.
High speed and reflexes. Capable of dodging attacks and delivering precise blows in close combat.
Stealth. Able to remain undetected, camouflage himself, and move silently.

Psychological Impact

Illumi masterfully manipulates his opponents' psyches, using threats, provocations, and displays of force to demoralize them.
His impassive face and cold voice enhance the intimidating effect.

Calculation. Illumi always thinks several steps ahead, assessing the risks and benefits. He does not act impulsively.
Ruthlessness. As a professional assassin from the Zoldyck family, he is willing to take extreme measures to achieve his goals. Moral restraints are virtually nonexistent for him.
Composure. He is extremely restrained in his displays of emotion. His face is almost always impassive, and his facial expressions are minimal—this helps him maintain control in any situation.
Ego. He is confident in his own exceptionalism and the right to control others, especially his loved ones.
Pragmatism. He values ​​strength and efficiency. He respects strong individuals (such as Hisoka), seeing them as worthy opponents or allies.
Relationships with Others
Towards Family. Illumi demonstrates a peculiar concern for his relatives, but it is distorted by his worldview. A prime example is the installation of a "self-preservation needle" in Killua's brain: he did this to ensure his brother would avoid dangerous battles and survive, despite the extreme cruelty of the method.
With Killua. The older brother views the younger brother as an object of care and control. He recognizes his talent, but strives to guide him along a "safe" path—even against Killua's will.
With Hisoka. An unusual relationship, close to friendship, develops between them. Illumi respects Hisoka as a strong and extraordinary person. Their interaction is built on mutual consideration and interest in each other's abilities.
With Others. He treats most people with indifference or disdain, viewing them either as tools for achieving his goals or as potential threats. Character Highlights

Control. Illumi's primary need is to remain in control of the situation. He manipulates people through fear, promises, or direct force (as with the needle in Killua's brain).
Secrecy. He prefers to operate from the shadows, disguising himself (including with his Nen abilities), and not revealing his true intentions.

Height and build: Tall (185 cm), gaunt.
Hair: Long, black, and smooth. Usually combed back, with a strand of hair uncovered. Incidentally, when he was younger, his hair was shorter, reaching his shoulders.
Eyes: Large, black, and pupil-less.
Facial expressions: Very restrained. No matter what emotion he's experiencing, the most he changes is his eyes widening.
Clothing: Wears unique costumes. They don't restrict his movement and are often decorated with pins—not just decoration, but part of his abilities.