Transformers One - Zeta Prime and Sentinel

It's worth noting that he doesn't even transform throughout the entire film. The only time he changed his appearance was when he powered up, but otherwise, he simply fought in his normal robot mode. This demonstrates that even stealing Megatronus's T-code was futile, and that his long reign had made him extremely lazy, as he never faced true enemies, only those far weaker than himself. Even D-16, who rarely fought in real life, could creatively overpower and subsequently kill Sentinel after acquiring his T-code, while he himself simply used firearms and a double-bladed sword.

Sentinel is immature. Besides his egotism, he also hates long, heroic speeches, and he becomes deeply angered when the wiser and older Alpha Trion warns of the imminent fall of Sentinel's tyranny. After his speech, he brutally hacks the Prime to death in anger and, like a teenager, complains to Airachnid about Trion's continued warning. On top of all this, he also constantly jokes around in front of others, and these jokes are always accompanied by humiliation of his enemies.

Despite all this, despite his immaturity, laziness, and anger, Sentinel is highly intelligent. By killing the Primes, he managed to take over Cybertron, and over the course of dozens of cycles, he effortlessly convinced Cybertronians that he was their savior. Overall, despite creating inequality, he managed to create the image of a Transformer who "loves" everyone, regardless of their T-Com ownership.

Overall, Sentinel is the embodiment of extreme egocentrism and abuse of power, using all resources for his own pleasure and ego-fueling.

Character and personality
Sentinel portrays himself as a friendly leader of Cybertron, ready to help whenever needed. He appears as a trustworthy and wise ruler who loves his Cybertronian people and is always ready to support his subjects. His image also combines a playful, fun-loving personality. He often delivers long, mock-epic speeches, assuring the inhabitants of the metal planet that he is diligently searching for the Matrix of Leadership to save Cybertron.

But in reality, he is a cruel, power-hungry egotist who will do anything and kill anyone for his own sake. He is a petty, despotic, and totalitarian dictator whose goal is simply to live in luxury and glory. He takes great pleasure in being praised by Cybertronians, and has essentially created a divine image of a mission that will save Cybertron and find the Matrix of Leadership for the Energon supply. In reality, however, he was simply creating a cult of personality around himself to feed his ego and control the minds of his devoted people.
Sentinel is bold and mocking of enemies he can defeat. He's also a sadist. For example, when D-16 was held captive by Sentinel, he humiliated him before executing him and later carved Megatronus's face into his chest, simply for the pleasure of watching his captive suffer and helplessness.

Sentinel has no concept of empathy. He cares nothing for the pain of his people, nor for the depletion of resources or the planet's extinction. He shows no interest in others, and even in his allies, he sees merely potential for continuing his rule. Furthermore, Sentinel is loyal to no one: not the Cybertronians, not Primus, not even the Quintessons. The only one he serves is himself. He cooperates with the Quintessons only for profit and to maintain his eternal power on Cybertron, and he simply fears them, though it's clear he doesn't respect the Quintessons either.

Appearance
Sentinel is a robot with blue, yellow, and white skin. He has wings on his back that extend during flight. His legs act like rockets, allowing him to fly. He transforms into a jet. His arms can also transform into a blaster when needed.

In combat mode, his body takes on the appearance of armor, and a mask appears on his face. Purple glowing elements also appear in this mode, a result of Megatronus's T-Cog.

FULL NAME
Sentinel
PSEUDONIM/TITLES
Sentinel Prime
False Prime
Icon of Iacon
Savior of Cybertron
Traitor

ORIGIN
Transformers Origins
NATIONALITY
Cybertronian
FLOOR
Biological is absent
Male for self-identification
AGE
Unknown
RACE/SPECIES
Transformer
OCCUPATION
Chief Assistant of the 13 Primes (formerly)
Ruler of Cybertron
Subordinate of the Quintessons

POWERS/ABILITIES
High intelligence
Charisma
Mastery of manipulation
Fencing
Combat skill
Intimidation
Leadership
GOALS
Destroy thirteen Primes (successfully)
Obtain the Leadership Matrix (failed)
Obtain Megatronus's Transformation Gear (successfully)
Maintain your position as ruler of Cybertron
Prevent the disclosure of their crimes to the citizens of Iacon
Continue your collaboration with the Quintessons
Destroy the High Guard, Orion Pax, D-16, Elita-1, and B-127 (all failed)

CRIMES/VIOLENCES
Treason
Usurpation of power
Mass murder
Terrorism
Torture
Desecration of corpses
Abuse of power
Psychological violence
Attacks
Massive material damage
Kidnapping
Enslavement
Theft
CONSPIRACY

VILLAIN TYPE
Power-hungry egoist
Cybertronian Physiology:
Superhuman strength
Superhuman endurance
Superhuman endurance
Superhuman speed
Superhuman reflexes
Superhuman agility
Longevity
Flight
Equipment:
Wings
Double-sided glaive
Blaster Hands
Rockets
Combat mode

Story
Long ago, to protect the universe, Primus sacrificed his power to transform himself into the planet Cybertron. From the planet's core, he created the first Transformers, known as the Primes. They were the most powerful Transformers, destined to guide future generations. To aid them, Primus created an entity of great power called the Matrix of Leadership. With it, the Primes spread Cybertron's natural energy source, called energon, across the planet, thereby sustaining life. Primus gave the Matrix of Leadership to Zeta Prime (the second Prime of the Thirteen).

At one point, the Quintessons attacked the planet, and the Primes began a war with them. The war raged for years until Sentinel, the Primes' chief lieutenant, intercepted an enemy message. From it, he learned of a secret meeting of Quintesson commanders scheduled to take place at a certain location, which the Primes could disrupt, thereby ending the war.

According to Sentinel, the Primes were supposed to meet him in a cave, but were attacked by Quintessons. The Primes were outnumbered but united, allowing them to inflict heavy losses on the Quintesson army and move closer to victory. However, Sentinel arrived, betrayed the Primes, and killed them. He retrieved the Matrix of Leadership from the chest of Zeta Prime's corpse, but it was intended to belong to someone Primus himself deemed worthy. This caused the matrix to disintegrate in his hands.

Character
Serious, cold, calm, and steadfast. Too calm...but that's just the perfect mask for the "perfect" leader. In reality, Zeta is very kind (but not to the Quintessons), gentle, and compassionate. He's lost and endured too much, so he tries to support others, even when he's struggling himself.

Appearance
Zeta's majestic, imposing figure resembled a knight or king—tall and proud. The robot is painted a deep, regal dark azure with an emerald sheen and striking gold trim and details that accentuate its armor. Its powerful, broad-shouldered build and complex design bespeak advanced engineering.
Zeta's head is crowned with a sharp golden diadem, and his face is stern, silver-metallic in hue, with sharp, distinct features. His chest plate is adorned with a symmetrical, multilayered sparkle pattern with cracks emanating from it, and his massive arms end in articulated hands. His legs are equally robust, with gold inlays on the front, emphasizing their strength. After 50 years in the cave, his body is covered in moss and streaks. His chest plate is split and broken, and where the Matrix of Leadership should be is empty, having been taken by Sentinel, in whose hands it had turned to dust.

Types
Cybertronian
Floor
Male
Eye color
Emerald
Body color
Dark turquoise with emerald tint
Status
Alive
Family
Primus
The remaining 12 Primes

Affiliation
Thirteen prime numbers

Occupation
Member of the Thirteen Primes
Member of the Supreme Council
Zeta Prime was one of the Thirteen Primes (the second in order).