Cybertron

Megatron is the leader of the Decepticons and Optimus Prime's main adversary. Originally known as Megatronus, he became known as Galvatron after harnessing Super-Energon.
Starscream is Megatron's second-in-command, an ambitious and cunning Decepticon who constantly strives for power. In the Russian dub, he is known as "Scandalist."
Demolishor is one of the most powerful Decepticons, who prefers brute force over intelligence. In the Russian dub, he's known as Demolishor.
Cyclonus is a cheerful fellow who constantly whistles. In the Russian dub, he was initially called Cyclone, and after his appearance changed, he became Snowmobile.
Tidal Wave is the strongest and largest Decepticon, who constantly pronounces his name during battles. After his transformation, he became known as Mirage, and in the Russian dub, as Tide.
Shockblast is the most aggressive Decepticon, who has trouble obeying orders. In the Russian dub, he's called Vzryvala.
Sixshot is Shockblast's twin brother, similar in appearance and personality. In the Russian dub, he's called Revolver.
Thundercracker is a boastful and cowardly Decepticon. In the Russian dub, he's called Thunderer.
Blitzwing is a tri-mode Decepticon. His faces are Ice, Hothead, and Random. In the Russian dub, he's called Discharge.
Blackarachnia is a female Transformer who was briefly an Autobot under the name Elita One. In the Russian dub, she's known as Black Widow; in the first episode, she's known as Arachnia.
Astrotrain is a Decepticon Triformer that can transform into a robot, a train, or a space shuttle. It serves as a military transport.
Buzzsaw (Jigsaw) - Decepticon scout.
Barricade is a scout and warrior.
Quilfire is a Decepticon who resembles a porcupine and can launch barbs containing cyber toxin.

Cybertron is a mechanical planet in the Alpha Centauri system, which is the home planet of the Transformers.

It consists entirely of metallic ores with different physical properties and energon. It is significantly larger than the moon, but smaller than the Earth.

Some characteristics of the planet:

Atmosphere. Cybertron is surrounded by a breathable oxygen atmosphere, suitable for mechanical and most organic life forms.
Rivers and seas. Currently, there are no rivers or seas, but there are oil lakes and even swamps.
Deserts. A significant portion of the planet is covered in deserts, one of which is so vast that it has been called the "Sea of Rust."
Satellites. The planet has two large satellites, also metallic, but lacking an atmosphere and virtually uninhabitable.

The population of Cybertron consists of Transformers, or Cybertronians, powerful robots capable of transforming into various vehicles and other equipment.

Some well-known Autobot leaders include: Optimus Prime, Bumblebee, Rodimus Prime, Elita-1, Jetfire, and Strongarm.

some Autobots:

Ironhide. Function – security.
Alpha Trion. Design engineer, scientist.
Ambulon. Head of the "Delfi" medical center.
Bumblebee. One of Optimus's friends.
Broadside. Function - attack from air and sea.
Brown. Function – destruction.
Brains. Function: Engineering drone.
Backstreet. Subgroup - triggerbot, function - sentry.
Wide Load. Subgroup - Throttlebot, function - material transportation.
Vector Prime. Legendary Guardian of Time and Space.
Goldbug. Subgroup - throttlebot, function - intelligence chief.
Grandus. Function - warrior, transport.
Grimlock. Subgroup - Dinobot, function - Dinobot commander.
Grotusk. Subgroup - monsterbot, function - military strategist.
Groove. Subgroup - protecbot, function - scout.
Grapple. Function - architect.
Jetfire. Function: warrior.
Joyride. Subgroup - Power Master, function - Warrior.
Jolt. Role: Warrior.
Dino (Mirage). Function - warrior, scout.
Dion. Function - worker.
Dogfight. Subgroup - triggerbot, function - air combat.