The Fallen

His true name Megatronus is nearly forgotten, only remembered by his descendances. The Fallen is a rather sore about what happened ever since his banishment to his prison realm. Blamed for killing his love Solus prime. He vows to get revenge for her true killer and for his banishment.

Though unable to physically go out of his prison. Megatronus can manipulate the universe in a limited way. He is interested in Megatron, who sport his name and has some his qualities.

He can wield the Requiem Blaster and is more or less constantly burning like a furnace. He may not be able to escape as of yet. But the Autobot-Decepticon war gives him entertainment which drowns his sorrow.

History:

According to legend, Megatronus was one of the first cybertronians to be made, one of 13 to defeat Unicron, in which they succeeded thanks to the matrix and the Requiem blaster, and for a time was loved by his brothers.

Post Unicron battle and he and solus has fallen in love with each other. He was amazed by what she created like the Matrix of Purification, the Apex Armor and the Allspark. But then at some point they got into an argument which killed Solus and he got banished to a prison realm.

In reality it was a jealous Liege Maximo but it was no use. He watched as the Cybertronian race was born and shaped. And as his legend taking shape and his name being forgotten to an extent of being called the Fallen.

He was rather flattered when a Gladiator named himself after him as Megatron. He rather saw the great war as a cure of his boredom and seeing the technological advancements hoped for an accident which would releasement.

He was also mentioned by Brainstorm who was reading about him, and later seen the Liege Maximo board the lost light.[Spotlight Brainstorm]He was reflecting on what he saw happen in the Universe over the Aeons when he was freed by Logos[Freeing the Fallen]

With the help of Logos prime, Megatronus got his revenge on Liege Maximo and not only killed him, but used him to revive Solus prime, before living with her for eternity in his former prison[Return of the Fallen]

He was mentioned in Vector Primes book about Multiversal travel[A guide to the Multiverse]He was seen fighting Mogahn during the Mogahn crisis[The end has come...]

Notes:

The Fallen is more like his aligned self then anyone else, though he resembles his movie self and G1 self at times.

Vector Prime implies that He has destroyed many versions of Apokalips and New Genesis in the Wayne cluster, and perhaps even titan in the Thanatos cluster. However he probably was bluffing about being able to take on Mr Mxyzptlk.