Teenage Mutant Ninja Turtles, Their Friends, and a Peculiar Child

Selfishness and arrogance. As a person, Chris Bradford was selfish, egocentric, and manipulative.
Determination. After his initial mutation into a mutant dog (Sharptooth), he demonstrated determination in achieving his goals, such as attempting to defeat the Turtles.
Viciousness and cruelty. After his second mutation into Rahzar, he became more dangerous and bloodthirsty.
Loyalty to Shredder. Rahzar remained the most loyal warrior of the Foot Clan and carried out Oroku Saki's orders.
Retaining some human traits. Despite the mutations, he retained human intelligence and the ability to speak, although his voice became deeper.

Rudeness and cruelty. Like many bandits, he is rude, hot-tempered, and sarcastic.
Loyalty to Shredder. Xever deeply respects and is loyal to him because he rescued him from prison, giving him protection and purpose in life.
Greed and love of money. He is very selfish and willing to do anything for financial gain.
Sadistic tendencies. He displays sadism in his actions—for example, he took pleasure in watching other characters mutate at Shredder's command.
Manipulative. As a crime boss, he seeks out outcasts to recruit into his organization (for example, Mondo Gecko).
A tendency to underestimate enemies. This often leads to defeat.
Cowardice in certain situations. In some situations, he displays cowardice, which sometimes proves wiser than continuing to fight.
Dishonesty. Willing to let others down to avoid punishment for failure.

Vicious and cunning, Tiger Claw is presented as a seasoned assassin and bounty hunter, driven by power and vengeance.
Lack of honor. In the episode "Tiger Claw's Wrath," it is shown that he has no clear code of honor—he will attack defenseless people.
The ability to assess a situation accurately and retreat in time. Despite his aggressiveness, Tiger Claw is able to assess the situation clearly and avoid taking unnecessary risks.
Immense willpower and restraint. He is able to overcome pain and endure difficult trials.
Detachment and gloom. His behavior is often characterized by isolation and a lack of emotion.
Concern for humanity and the planet. Unlike some of Shredder's other minions, Tiger Claw sometimes shows concern for the world and doesn't follow orders unquestioningly if he believes them to be wrong. For example, he was shocked by Shredder's decision to prevent Splinter from stopping the planet's destruction.
Honesty within his principles. Unlike some other characters, he strives to act with integrity and fulfill his obligations.

Impulsive and hot-tempered. Casey often acts on the spur of the moment, without always considering the consequences. Because of this, he can be quite ruthless in combat.
Straightforwardness. He's not inclined to look for shortcuts—he prefers to resolve issues by force.
Trauma and isolation. As a child, the Purple Dragons gang attacked his family: they burned down his father's store, killed his father, and took his mother and sister hostage. Casey himself suffered severe injuries, and this left a mark: in some versions, he even developed post-traumatic stress disorder (for example, his eyes sometimes "reflected" the face of an enemy). Because of this, he remained rather withdrawn and uncommunicative for a long time.
A thirst for revenge. His motivation is often personal. He specifically hunts the Purple Dragons and their leader, Han, seeing them as the culprits behind the tragedy.
Kindness and empathy. Despite his harsh methods, Casey is capable of noble deeds. For example, in one story arc, given the opportunity to kill Han, he consciously chooses to spare his enemy.
Loyalty to Friends. He becomes a trusted ally of the Teenage Mutant Ninja Turtles and develops deep attachments to those he considers close—most notably April.
Flirtatious and narcissistic. In some adaptations (such as the 2012 animated series), Casey can be quite arrogant and self-absorbed. However, he can also be playful, especially when interacting with April.

Friendliness and compassion. April develops a genuine attachment to her friends and is ready to help them in times of need. She becomes not only an ally for the turtles but also a link to the outside world.
Stubborn and decisive. She's not afraid to take risks for her beliefs or those close to her. It's difficult to convince her otherwise once she's made up her mind.
Sense of Responsibility. April takes her responsibilities very seriously and cares deeply for those she considers family.
Intelligence and resourcefulness. She's not only tech-savvy but also adept at analyzing situations, conducting experiments, and finding solutions to complex problems.
Recklessness. Sometimes her decisiveness borders on recklessness, especially when she acts out of emotion rather than cold calculation.
Emotional vulnerability. She reacts strongly to threats to her loved ones. A prime example is the episode when April temporarily severed ties with the turtles, mistakenly believing they were responsible for her father's mutation.

A genius intellect and a passion for science, Donnie is the team's brains. He's passionate about technology, mechanics, mathematics, biology, physics, and other disciplines. He designs gadgets, weapons, armor, and vehicles for his brothers, and also studies technology, the nature of the Kraang, and other villains.
Ingenuity. He doesn't just create devices—he thinks strategically, devising multi-stage plans to defeat his enemies.
Compassion. Despite his apparent fixation on technology, Donnie can be gentle, understanding, and caring. He often acts as a peacemaker in conflicts between his brothers and tries to support those close to him.
Ability to find a way out of difficult situations. In critical moments, he is able to quickly assess the situation and propose an effective solution.

Cheerful and optimistic, Michelangelo always tries to see the bright side of life and find positivity even in difficult situations. His cheerfulness helps maintain a friendly atmosphere within the team.
He has a great sense of humor. He loves to joke, make puns, and tease his brothers. His jokes often serve not only as entertainment but also as a way to relieve tension.
Frivolous and immature. As the youngest of the brothers, he's prone to frivolous behavior and is often distracted by entertainment. He's easily captivated by new things and can quickly lose interest.
Impulsive. He often acts on the spur of the moment, without always considering the consequences. However, Splinter noted that it is precisely this ability to act on instinct, without wasting time on long deliberation, that makes Michelangelo a valuable ninja.
He has a photographic memory. He can remember and later use very complex things.
Kind and compassionate, he genuinely empathizes with others and is willing to help those in need, regardless of his own.
He craves recognition and interaction with the outside world. He is very sociable and wants people to accept him and his brothers.
He's creative and inventive. He often comes up with a ton of ideas, and every now and then, one of them turns out to be brilliant.

Hot-tempered and impulsive, Raph often acts on impulse, without considering the consequences. This makes him decisive in battle, but sometimes creates problems for the entire team.
Aggressive and straightforward. He tends to go straight to the attack, not standing on ceremony with his opponents.
Sarcastic and cynical. Raf loves to make sharp, caustic remarks, sometimes even offending others. This is often a defense mechanism—the sarcasm conceals an inner vulnerability.
A desire for independence. He craves freedom and isn't always willing to submit to rules and authority. This is especially evident in his relationship with his older brother, Leonardo: Raf admires his leadership qualities, but simultaneously envies and resents his authority.
Physical strength. He's often referred to as "muscle" on the team—he's the strongest physically, and relies primarily on strength in combat.

He has a deep affection for his brothers. Despite their quarrels and teasing (especially with Michelangelo, who constantly makes fun of him), Raph loves them very much and is ready to fiercely protect them if any of them are in danger. He even admitted that he is willing to risk his own life, but never his brothers'.
Empathy. Beneath his cynicism, he often conceals an understanding of others' experiences. Sometimes he even helps his brothers, for example, by supporting Miki, helping Donnie, or having heart-to-heart talks with Leo.
Struggling with inner demons. Some stories reveal that the source of his anger is the realization that he and his brothers are the only ones of their kind, condemning them to loneliness. Other stories show him learning to control his rage—for example, with the help of Splinter's guidance.

An interesting twist: as the story progresses, Raph gradually softens. He stops constantly challenging Leonardo and becomes more friendly with his family and allies.

Leadership qualities. Splinter chose Leo as his leader not only because of his skills but also because of his willingness to take responsibility. He is skilled at making difficult decisions, directing a team, and structuring actions.
Discipline and determination. Leo is the most diligent in training among the brothers. He constantly strives for self-improvement, striving to become the perfect hero.
Responsibility and caring. He deeply feels the burden of leadership: it's important to him to protect his brothers, Splinter, and his friends (April, Karai). Leo is willing to do anything for his family.
Calm and level-headed. Unlike the hot-tempered Raphael, Leo often maintains his composure in combat and difficult situations.
Perfectionism. He strives to meet high standards, which sometimes leads to internal conflict: Leo is afraid of not living up to his teacher's expectations or letting the team down.
Sense of humor. He has a funny side, though his brothers don't always notice or appreciate it.
Respect for his mentor. Leo values ​​Splinter highly, listens attentively to his advice, and tries to live by it.