Megatron - TFP

After Megatron was crushed by Metroplex and then reassembled and revived by Soundwave, his armor became thicker, all the black parts of his body were removed (even his cannon was replaced with a gray one), and the red parts remained only on his forearms and small areas on the backs of his legs. The glowing spots became more numerous.
When Megatron returned to Earth to once again lead the Decepticons, he appeared before his subordinates with a new appearance: he wore gray armor with numerous pointed and rounded elements, almost completely enveloping his body. The cannon on his right arm became purple, as did the backs of his shins. The Decepticon emblem moved from the lower part of his body to the upper part.

Personality
In the animated series, Megatron was portrayed as cunning, cruel, selfish, sadistic, and heartless. He was a highly skilled manipulator and charismatic leader, capable of winning over an army of Cybertronians and earning the undying loyalty of some, such as Dreadwing and Soundwave. However, this loyalty was not reciprocated, as Megatron seemed to have no regard for the lives of his Decepticons—as evidenced by his abandonment of Breakdown when he was kidnapped by a MECH. This stemmed from his aversion to weakness: in Megatron's view, only the strongest could survive. Megatron's primary goal was power, and he unhesitatingly eliminated anyone who stood in his way, such as Silas, Airachnid, and Predaking. He also never turned down a good fight—likely a result of his experience as a gladiator in Kaon.

Megatron, while disgusted by failure and incompetence, was somewhat tolerant—as evidenced by his agreement with Dreadwing's initial desire to punish the Autobots for the death of his brother, Skyquake—but only toward those who had proven their undying loyalty to him. He was also extremely prejudiced, viewing all life in the galaxy as inferior to Cybertronians, especially organic lifeforms like humans. His only redeeming quality was that he never discriminated against the various Cybertronian species, though he vowed to destroy his longtime enemy, Optimus Prime, and his Autobot followers at any cost. Megatron's arrogance and pride are so inflated that he refuses to allow anyone else to kill Optimus, and any bot who dares interfere will suffer his wrath.

Status
Alive
Place of death
Cybertron (first death; resurrected)
Nemesis, in orbit
Fraction
Decepticons
Floor
Male
Body color
Silver, purple (formerly)
Beige, gray, purple
Color of eyepieces
Red
Alt form
Cybertronian tank (formerly)
Cybertronian starship
Weapon
Sword (temporarily)
Fusion Cannon, Built-in Blade (formerly)Nicknames
Lord Megatron (almost all Decepticons)
Big M (Knockout[1])
Buckethead (Bulkhead, Smokescreen[2])
Megacron, Unitron (Smokescreen[2])
Proud Fool, Worm (Unicron[3])
Our true lord and master (Insecticons[4])
Master (Starscream[5], Airachnid[3])
Mister (Starscream[6], Knockout[1], Shockwave[7])
Bucket of Nuts (Bulkhead[8])
Arrogant Fool (Starscream[9])
Job title
Decepticon Lord (formerly)
Rank
10[10]
Allies
Soundwave
Shockwave
Starscream (formerly)
Optimus Prime (formerly)
Enemies
Starscream

Wild and ferocious, they attack anything that moves unless they receive an order not to attack.
Almost devoid of intelligence—most can't even speak. Only two are known to speak: Hardshell and Bombshock.
They are susceptible to telepathy - this is used by Airachnida (who subjugates them as a "queen") and, to some extent, Megatron (after eliminating Airachnida, they swear allegiance to him).
Swarm tactics: By uniting into a swarm, Insecticons literally overwhelm the enemy with their sheer mass. A single Insecticon nearly killed Megatron in a fair fight, and an entire swarm could have captured the Nemesis.

Hardshell is the leader and most dangerous of the beetles.
Appearance: Larger than standard Insecticons, black and green with silver accents and red optics. His entire body is covered in scars and cracks in his armor—the remains of battles with Autobot Destroyers. These injuries immediately distinguish him from the otherwise faceless ranks of his brethren.
Personality:

A proud warrior, he exalts the Insecticons over regular Decepticons and disdains the Vehicons. He considers chattering during battle beneath him: "Talk in battle is a sign of weakness."
He's more cunning than he looks—unlike his kin, he knows how to assess chances and outsmart his opponents. He figured out Bulkhead's diversionary tactic.
He cares about his own people - he stands up for his brothers when the Vehicons mock them.
Boastful - constantly mentions how he "destroyed" Bulkhead and boasts about his victories over the Ravagers.

Eirachnida is the "queen" of the swarm
Strictly speaking, Airachnida isn't an Insecticon, but a Decepticon "spider," but she is a key figure in their "Prime" story. She possesses the telepathic ability to subjugate Insecticons.

Personality: Cunning, selfish, cold-blooded. Anyone she collaborates with must expect a knife in the back.

Appearance
The Insecticons in Prime are among the largest Transformers in the universe. They're taller than both Optimus Prime and Megatron—and Megatron, by the way, is quite a big man.

Alt-form - a giant Hercules beetle. In beast mode, they are six-legged, with an armored head, a nasal blade, and claws. They make a loud buzzing sound, like giant flies.

The robot form is a massive humanoid with a distinctive feature: the "extra" limbs from the bug mode transform into an extra pair of arms with claws, which the insecticon uses to grab and restrain enemies. The main pair of arms are equipped with laser pistols on the wrists. The face has a single horizontal visor strip instead of separate eyes, resembling the Cyclopes from the X-Men.

While in flight, the Insecticon can fire pistols at its opponents or ram them with its armored head. In close combat, it uses its teeth and claws.

The coloring is usually green, sometimes with black and silver elements. The optics are red. Individual characters vary their coloring to distinguish them from the crowd.