Massive Multiplayer Crossover / Transformers: Legacy

The Excuse Plot for the line is that the various bots have all been transported from their home universes to the eponymous "Legacy World", where they are now doing battle with one another, both via the standard "Autobots vs. Decepticons", but also cases of Enemy Civil War. Said inhabitants are also shown to be taken from different points in time, most evident with the characters from the Aligned Continuity and the Unicron Trilogy.

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Autobots

Generation One Universe

• Optimus Prime
  • G1 Orion Pax
• Bumblebee
  • Goldbug
• Elita-1
  • Erial
• Hot Rod
• Jazz
• Wheeljack
• Trailbreaker
• Sunstreaker
• Hound
• Gears
• Beachcomber and Paradise Parakeet
• Cosmos
• Blaster and Eject
  • Rewind^note Packaged with Twincast
• Skids
• Sandstorm
• Devcon
• Guardian Robot
• Dion
• Pointblank and Peacemaker
• Alpha Trion
  • Vector Sigma
• Nightprowler
• Road Hauler
• Silverstreak
• Senator Crosscut
• Medix
• Red Cog

Dinobots/Volcanicus

• Grimlock
• Slug
• Sludge
• Swoop
• Snarl
• Scarr

Wreckers

• Springer

Japanese G1 Universe

• Victory Saber
  • Star Saber
  • Victory Leo
• Galaxy Shuttle
• Minerva
• Metalhawk
• Twincast
• Autorooper^note Alternate head for Animated Autotrooper, intended to evoke the appearance of the Kiss Players Autoroopers

Rescue Patrol Team

• Holi
• Fire
• Boater
• Pīpō

Diaclone Universe

• Burn-Out
• Clampdown
• DK-2 Guard
• DK-3 Breaker
• Lift-Ticket

Wreckers

• Twin-Twist

Comic Universes

Marvel Comics Universe

Wreckers

• Impactor

IDW Universe (2005)

• Blurr
• Orion Pax

IDW Universe (2019)

• Senate Guard Javelin

Generation 2 Universe

• Laser Optimus Prime
• Road Rocket

Wreckers

• Leadfoot

Robots in Disguise 2000 Universe

• Omega Prime
  • Optimus Prime
  • Ultra Magnus
• Side Burn
• Tow-Line

Unicron Trilogy Universe

Armada

• Optimus Prime
• Hot Shot
  • Minicon Jolt

Cybertron

• Metroplex
• Override
• Hot Shot
• Vector Prime

Animated Universe

• Optimus Prime
• Bumblebee
• Prowl
• Autotrooper

Aligned Universe

Prime

• Arcee
• Bulkhead
• Cliffjumper

Rescue Bots

• Chase

Robots in Disguise (2015)

• Strongarm

Cyberverse Universe

• Windblade
• Chromia

Legacy Universe

• Lunar Tread
• Malleus Minotaurus

Wreckers

• Spindle
• Masterdominus

Junkions

• Scraphook
• Crashbar
• Trashmaster

Maximals

Beast Wars

• Dinobot
• Tigerhawk
• Silverbolt (Fuzor)

Beast Machines

• Cheetor

Japanese Beast Wars

• Leo Prime
• Tasmania Kid
• Bluebolts^notePackaged with Omega Prime. As revealed by Hayato Sakamoto, Bluebolts from RID 2000 is the same entity as the Maximal Weaponizer from the End of G1 Universe comic

Decepticons

Generation One Universe

• Starscream
• Soundwave
  • Laserbeak^note Cassette mode, a non-transforming accessory included with Core Class Soundwave
  • Three Unknown Cassettes
• Shockwave
• Skywarp
• Thundercracker
• Generic Seeker
• Nemesis
  • Ramjet and Thrust^note microfigures of their jet mode, included for display
• Dirge
• Blitzwing
• Galvatron
• Cyclonus and Nightstick
• Needlenose and Sunbeam & Zigzag
• Quake and Tiptop & Heater
• Squeezeplay and Lokos
• Crankcase
• Soundblaster
  • Buzzsaw^note Cassette mode, a non-transforming accessory included with Core Class Soundblaster
• Nemesis Prime
• Slipstream

Stunticons/Menasor

• Motormaster
• Dragstrip
• Wild Rider
• Dead End
• Breakdown

Pretenders

• Iguanus
• Bomb-Burst
• Skullgrin

Insecticons

• Kickback
• Shrapnel
• Bombshell
• Ransack

Mayhem Attack Squad

• Barrage
• Chop Shop
• Windsweeper

Japanese G1 Universe

• Black Zarak
• Deathsaurus and Tigerchest & Eaglechest
• Magnificus
• Browning^note Packaged with Squeezeplay in gun mode as a weapon accessory

Comic Universes

IDW Universe (2005)

• Tarn

IDW Universe (2019)

• Bludgeon

Ascenticons

• Kaskade
• Nacelle

Generation 2 Universe

• Megatron
• Shadowstrip

Cybertronian Empire

• Jhiaxus
• Empire Troopers

Go-Bots Universe

Renegades

• Crasher

Robots in Disguise 2000 Universe

• Scourge

Unicron Trilogy Universe

Armada

• Megatron
  • Galvatron
• Starscream
• Tidal Wave

Energon

• Megatron
  • Galvatron

Cybertron

• Starscream

Animated Universe

• Motormaster

Aligned Universe

Prime

• Knock-Out
• Skyquake
• Dreadwing

Mayhem Attack Squad

• Breakdown

Cyberverse Universe

• Shadow Striker
• Tarn

Legacy Universe

Mayhem Attack Squad

• Ozone & Cleansweep^noteOzone and Cleansweep are Windsweeper's Triggercon guns as individual robots

Junkions

• Axlegrease

Predacons

Beast Wars

• Tarantulas
• Inferno
• Transmetal II Megatron
• Terrorsaur
• Scorponok
• Buzzsaw
• Sandstorm
• Skywasp
• Antagony
  • Scavenger^noteAlternate head included with Antagony

Japanese Beast Wars

• Magmatron

Independent Factions

Star Seekers

G1 Universe

• Lockdown
• Ferak

Cybertron Universe

• Cannonball

Aligned Universe

Prime

• Thundertron

Robots in Disguise (2015)

• Filch

Junkions

G1 Universe

• Detritus

Legacy Universe

• Junkasaurus^noteThe combined form of Trashmaster, Scraphook, 2 Crashbars, and Axlegrease

Quintessons

• Baliff/Allicon

Toxitron’s Warriors

Generation 2 Universe

Decepticons

• Toxitron
• Dead End
• Cloudcover

Autobots

• Jazz
  • Laser Cycle^noteWas originally named Jazz, but renamed to avoid confusion
• Mirage
• Sideswipe
• Grimlock

Armorizers

Infernac Universe

• Magneous
• Bouldercrash
• Shard
• Nucleous
• Unnamed Motorcycle Armorizer

Unaffiliated Individuals

Japanese Beast Wars Universe

• Nemesis Leo Prime

IDW 2005 Universe

• Senator Shockwave
• Nova Prime
• Senator Ratbat
• Miner Megatron