A list of ideas for this mod, based on each series.
A basic energon gun: a basic gun that any character could use.
Transtectors: An inaimate transformer body that players can drive in and transform into a full size transformer, it would solve people's requests for full size transformers, while maintaining the current concept. I imagine they would operate like the vehicles from Flan's Mod, minus the transformation ability. Transtectors should be late game, expensive items to create, with each being locked to one person/armor, becoming a full size version of that character.
Terrorcons- robotic cats and birds that are aggressive, they spawn when Energon Crysals are near iron ore, tying into the Allspark Mutations from the first movie, or simply energon crystals in dark areas underground. When they die, the drop energon crystals/pieces, iron ingots.
Omnicons: Small transformers that could act like villagers, trading energon pieces for Energon Crystals, or Energon Stars. The best part is, they would be player size and not be breaking lore.
Energon Stars: Only accessible from trading with the Omnicons, these objects automatically repair Transformium based armor and can be used as fuel by energon based weapons. They are expensive to by though.
Beast Mode transformers, nuff said.
Protoforms: Using Transformium and Energon, in Incubator blocks, the player can make NPC Transformers, that are loyal to them. Require the basic transformium molds placed in and energon block/source. Said Protoform would probably scan the first platform and alt-mode presented to them. Their mods are Follow, Guard (free roam around where they were told), stay ( won't move unless they see an enemy). They would use their signature weapons and ammo as well. On a multi-player server, I imagine the admin could turn them off, or they would simply be loyal to their faction members. An alternative is to use a Vector Sigma/ Allspark/ Matrix like device on your trophies.
Energon Farms: Blocks that can be used to grow artificial energon crystals. They can be used as fuel for weapons but not in crafting recipes for the armors, weapons etc.
Energon Harvestor: An endgame construct that generates energon crystal so long as the sun is shinning. Should be absurdly expensive to create and possibly a multi-block structure.
Tombs of the Primes: A special type of dungeon. They could have traps, enemies, puzzles to solve
Relics of the Primes: Found in Tombs of the Primes, they are high powered weapons, treasures would include.
Energon Matrix- Let's you turn trophies into NPCs. Heals the player and armor and weapon durability.
Star Saber- A powerful sword with a ranged attack
Requiem Blaster: The strongest gun in the game with/or unlimited ammo.
The Forge: A hammer/mobile crafting table, that let's you build mod related items with cheaper recipes.
Skyquake Shield: Reflects all projectiles when in use.