T

Tailgate,

Autobot. Transforms into a car. He is one of the Mini-Vehicles.

Tailspin,

Autobot micromaster. Transforms into a car. He is a member of the Race Car Patrol.

Tailwind,

Decepticon Micromaster. Transforms into a waterplane. He is a member of the Air Strike Patrol.

Takedown,

Autobot micromaster. Transforms into a construction vehicle. He is a member of the Autobot Construction Patrol.

Take-Off,

Decepticon Actionmaster. He is accompanied by a bird. This bird transforms into Take-Offs battle-armour.

Tanker Transport,

Autobot Micromaster Combiner Transport. This transport transforms into a base. The base is operated by Gusher and Pipeline. This is one of the Micromaster Combiner Transports.

Tantrum,

Decepticon. Transforms into a bull. He is one of the Predacons.

Tarantulas,

Predacon. Comes from the Beast Wars. Transforms into a spider.

Tarantulas,

Predacon. Comes from the Beast Wars. He is a Transmetal Figure, transforms into a spider or a motorcycle-like vehicle.

Targetmaster,

Group of Transformers that are accompanied by one or two Nebulons. Each Nebulon is able to transform into a weapon. The Large Targetmaster have one weapon, the Targetmasters have two weapons.
Large Targetmaster Autobots:
Blurr
Crosshairs
Hot Rod
Kup
Pointblank
Sureshot
Large Targetmaster Decepticons:
Cyclonus
Misfire
Scourge
Slugslinger
Triggerhappy
Targetmaster Autobots:
Landfill
Quickmix
Scoop
Targetmaster Decepticons:
Needlenose
Spinister
Quake

Technobots,

Group of five Autobots. Together they transform into Computron. They were created by Grimlock in Grimlock's New Brain. Their names are:
Afterburner
Lightspeed
Nosecone
Scattershot
Strafe

Teletran One,

The main computer of the Ark.

Tempest,

Autobot. Transforms into a car. He is one of the Canon Masters.

Tentakil,

Decepticon. Transforms into a monster. He is one of the Seacons.

Terrorcons,

Group of five Decepticons. They were created in Money Is Everything by the Quintessons. Together they transform into Abominus. Their names are:
Blot
Cutthroat
Hun-Grrr
Rippersnapper
Sinnertwin

Terrorgator,

Predacon. Comes from the Beast Wars. He is a Fuzor, transforms into a creature part box turtle, part alligator.

Terrorsaur,

Predacon. Comes from the Beast Wars. Transforms into a Pteradon.

Terrorsaur,

Predacon. Comes from the Beast Wars. He is a Transmetal Figure, transforms into a Pteradon, he has also a third mode.

Terror-Tread,

Decepticon Micromaster. Transforms together with Cement-Head into a construction vehicle. Together they operate the Cannon Transport.

Throttle,

Nebulon. Transforms into the engine of Darkwing.

Throttlebots,

Group of six Autobots:
Chase
Goldbug
Freeway
Rollbar
Searchlight
Wideload

Thrust,

Decepticon. Transforms into a jet. He is one of the Decepticon Planes.

Thundercracker,

Decepticon Actionmaster. His plane can transform into his exosuit. (Just like Circuit).

Thundercracker,

Decepticon. Transforms into a jet. He is one of the Decepticon Planes.

Thundercracker,

Machine wars. Transforms into a jet. He has the same shape as Skywarp.

Thunderwing,

Decepticon. Both robot and casing transform into a plane. In the comic books he was leader of one of the many Decepticon factions. He is one of the Mega Pretenders.

Tigatron,

Maximal. Comes from the Beast Wars. Transforms into a tiger, this is in fact a second release of Cheetor, but then in different colors.

Tiptop,

Nebulon. He and Heater transform into the weapons of Quake.

Topspin,

Autobot. Transforms into some sort of vehicle. He is one of the Jumpstarters.

Tornatron,

This creature, made of pure energy was created by Primacron.

Tote,

Autobot micromaster. Transforms into a van. He is a member of the Off Road Patrol.

Tracer,

Decepticon micromaster. Transforms into a helicopter. He is a member of the Military Patrol.

Tracer,

Nebulon. He and Holepunch transform into the weapons of Scoop.

Tracks,

Autobot Actionmaster. His missile launcher transforms into his battle-armour.

Tracks,

Autobot. Transforms into a car. He is one of the Autobot Vehicles.

Tracks,

Autobot from the second generation. Second release of Tracks. He is one of the Heroics.

Trailbreaker,

Autobot. Transforms into a car. He is one of the Autobot Vehicles.

Trakkons,

Group of two Decepticons: Black Omen (this is the same Transformer as Fearswoop.) and Roadraider.

Transmetals,

Transformers from the Beast Wars. They have metallic bodies and have three different modes (just like the Triple Changers).

Trap,

Decepticon. Transforms into a jet. He is one of the Scope Masters.

Tread Bolt,

Autobot micromaster. Transforms into a stealth bomber. He is a member of the Autobot Air Patrol.

Treadshot,

Decepticon Actionmaster. His weapon transforms into a jaguar.

Triggerbots,

Group of three Autobots: Backstreet, Dogfight and Override.

Triggercons,

Group of three Decepticons: Crankcase, Ruckus and Windsweeper.

Triggerhappy,

Decepticon. Transforms into a jet. In The Rebirth, part 2 his weapon was modified into a exosuit for Blowpipe. Due to this proces, he became a Targetmaster.

Triple Changers,

Group of Transformers that can transform into two different shapes.
Autobot Triple Changers are: Broadside, Sandstorm and Springer.
Decepticon Triple Changers are: Astrotrain, Blitzwing and Octane.

Tripredacus,

Predacon. This is a Beast Wars Gestalt. I have no data on his different components.

Trip-Up,

Autobot micromaster. Transforms into a car. He is a member of the Hot Rod Patrol.

Trypticon,

Decepticon. Transforms into Decepticon City. He was created by the Constructicons in Five Faces Of Darkness, part 4 to defeat Metroplex. Trypticon was defeated by Metroplex, but was soon repaired again.

Turbo Master,

Decepticon Actionmaster. Transforms into a jet. He is one of the Actionmaster Elite Figures.

Turbo Masters,

Group of Autobots. In some countries they are called Cannon Masters. All the relevant information on this group you can find there.

Twincast,

Blaster is destroyed in the Japanese series and rebuilt as Twincast.

Twintwist,

Autobot. Transforms into some sort of vehicle. He is one of the Jumpstarters.