Shockwave

Absence of a face: Shockwave has no mouth, nose, or usual eye sockets. His head is a sealed hexagonal or angular helmet.
One eye: At the very center of his head is a single large round photoreceptor (a monocular sensor). It usually glows bright yellow or red. This empty, unblinking stare creates the image of a merciless computer.
Antennae: On the sides of his head are two short antennae resembling "ears," which serve as sensors.

2. Body and color scheme:
   Purple coloration: Traditionally, Shockwave's color scheme is dominated by various shades of purple and violet, diluted with gray and black mechanical elements.
   Powerful build: In most versions, he is depicted as a massive, tall, and broad-shouldered robot. His armor looks angular and durable, emphasizing his status not just as a scientist, but as a dangerous fighter. In the film "Transformers 3: Dark of the Moon," his armor became more detailed, acquiring a gray-steel, ribbed shade and the look of cast fantastical musculature.

3. A weapon instead of a hand
   Astro-magnetic cannon: Instead of his left (in some versions — right) hand, Shockwave has a powerful laser cannon installed.
   Power cable: A thick ribbed hose (energy conduit) runs from the cannon to the robot's back or shoulder, supplying energy for his shots. The other hand remains normal — with massive fingers or claws for gripping.

Alternative form
Depending on the universe, Shockwave transforms into a devastating long-range weapon:
In the classic G1 animated series, he takes the form of a giant space laser pistol.

Personality
Cult of logic
Cold calculation: Shockwave knows no anger, hatred, or joy. Any decision — from conducting a cruel experiment to destroying a planet — he makes based on dry calculations of efficiency. If an action is logical, he will do it; if it's illogical, he will reject it.
Speech quirk: In conversation, he constantly uses the words "logical" and "illogical," justifying his every step with them.

Loyalty to Megatron (through the lens of logic)
Reliable regent: Unlike Starscream, who constantly weaves intrigues for power, Shockwave does not seek to take the leader's place. Megatron trusts him with the most valuable thing — the governance of the entire planet Cybertron in his absence.
Pragmatic devotion: Shockwave obeys Megatron not out of blind fear or adoration, but because he considers Megatron's leadership the most efficient and logical path to Decepticon victory. However, in some comics (such as IDW), if calculations show that the leader is leading the faction to destruction, Shockwave is ready to eliminate him without hesitation for the greater good.
Respect for facts: Shockwave does not despise Autobots or mock them. He acknowledges the intellect of Optimus Prime or the ingenuity of Wheeljack, if they are confirmed by facts.
Ruthlessness: He takes no sadistic pleasure in torturing enemies, but he will kill them in the fastest and most economical way, as soon as they cease to be of scientific interest.