Megatron -TSG-

Passionate, noble

Solitude (resides in the rust sea)

Stoic

Megatron from the Transformers Shattered Glass continuity was once the leader of the Decepticons, but in the IDW comic, he claims he was never worthy of that title. Nevertheless, he still cares for his Decepticon allies

In the Transformers Shattered Glass continuity, the Autobots are evil and the Decepticons are heroic, so Megatron is a good guy in this alternate reality

Borne from humble beginnings, the young idealist known as Megatron quickly found greatness thrust upon him, as the suffering of his beloved Cybertron under the maniacal Optimus Prime and his evil army of Autobots forced him to take up arms and lead his heroic Decepticon forces against them. Though the burden of leadership hangs heavy upon his shoulders, he continues to fight in the hopes of achieving peace and freedom for all beings, both on Cybertron and across the universe. Megatron is a deeply compassionate leader and unafraid to lay down his own life for the Decepticon cause, but this well-meaning tendency towards self-sacrifice often forces his faithful second-in-command Starscream to carry on leading the Decepticons without him.
In some universes, Megatron is reborn into an even more powerful form known as Galvatron. In both forms, he can wield the mighty Rumbler tank, his weapon of choice.