Disclaimer: I do not own these characters.
His master, Gabriel, had made him from magic and Grace to mirror his face. As a duplicate his responsibility is to watch and listen incase the god returned to Earth and only intervene when necessary.
He's silent as he flies into the cell not flinching when he's noticed. He gives Loki a wide berth when the trickster stands to straighten his head in place. He's jostled forward when the ship rocks in the air and alarms begin to sound in the distance.
Thor appears with Mjölnir in hand but Loki subdues him and brings the thunderer to his knees. The younger god runs a blue scaled hand through the gold hair as thorns ripple across exposed skin.
"Did you miss us? Did you mourn?"
Thor is in shock as he sees the tricksters body twist, "Loki, this isn't... what happened to you?"
"Answer me!"
The being watches both gods with a sneer forming on his face. He can feel his masters hate influence his thoughts toward the thunderer.
"I-I thought you dead. We all mourned. Our father-"
The trickster lets out a barking laugh that startles Thor.
"Loki, brother, please! Give up this poisonous dream! You come home!"
The mask Loki wears cracks and the clone can hear the hiss of anger Leviathan breathes as it takes hold of his host.
"No longer will I live in your shadow. Farewell, Odinson."
Pale skin begins to fold back and Leviathans teeth extend as it roars. The copy knows he should distract the trickster but he can't bring himself to stop what may happen. A blast of light and fire hits the god and shakes the clone from his anger. When Loki drops his prey the copy pushes Thor into the glass prison, locks it and casts it off the flying fortress.
~~0O0~~
'It shouldn't be this way', he thinks as the human gasps for breath. Coulson was brave standing up to the god but bravery wasn't enough to protect his fragile body. The mortal's eyes flicker up as he draws near. He sees the dying man finger the trigger as he tries to aim but he whispers calming words. The human goes limp, relaxing when he slowly mends the broken tissue. He knows the human will still die; only his master has the power to heal injuries this deep. He's lucky Leviathan had not deemed him worthy enough to be eaten.
"W-who are you?"
He ignores the question, "I can't help much but if you let me I'll ask my master to help you."
The mortal struggles for breath, "I…"
The clone shifts away when a one eyed suited man appears by his side. A sting of sorrow passes through him as he watches the short goodbye and thinks it isn't fair. Just before the Light leaves the humans eyes Coulson gives the clone a short nod. That's all the he needs and coaxes the soul out, wrapping it protectively in the borrowed energy of his master. More humans arrive and he knows it's time to leave.
Loki is no longer on the ship but the Grace he houses is easy to trace.
~~0O0~~
The battle has already begun by the time he reaches the city. The clone snarls as Chitauri descend upon Manhattan through the portal.
'Pests', he thinks.
There is so much chaos that it has attracted Mayhem's attention. Throughout the city he sees Mayhem split himself into twenty, then one hundred and more and more appear. All the different versions from other worlds are being pulled to this city and they each bring ruin in the shape of fire, twisted metal, and death.
He takes in the destruction as he lands on a dark building with black tinted windows*. The air trembles and for a moment the would-be angel fears it may mean something worse. The clone whispers for his master to return. He tells him Loki needs to be subdued before the old forces break and the balance of this world shatters.
As phantom wings carry him through the wreckage he tosses bits of power to shield hiding humans. Satisfied, he continues to follow the radiating shine of the trickster to a tall structure. Loki frowns when he realizes the replica of the angel has found him. He lashes out with bolts of green fire but the clone side steps his magic.
Another being tumbles into the building. The green ogre doesn't bother with the clone, his attention focuses solely on the god.
'Master, please.'
Loki's grins and pale lips peel back to expose jagged teeth. The green beast, oblivious to the change, is about to strike when a hand holds him firmly in place. The clone smiles as his master appears and he dissolves knowing he is no longer needed.
"I don't think so." Gabriel's eyes light with fury as he takes in the grunting mass. "Hmm, a sheep in wolf's clothing. Cute."
For a moment Hulk's form wavers, shrinking slightly but manages to hold his shape as he roars at the newcomer. Gabriel scoffs as he backhands the giant out of the window. He grins as the man-beast causes a crater in the street below. The smell of human blood jerks him back to face his other and he stills at the sight of the drawn sigils on the wall.
"Welcome back, Messenger."
"Loki, you need to fight Leviathan."
"It's time you accepted that this is us," Loki strays closer to the blood spell. "All the pieces are moving as planned and soon all of this will disappear."
Gabriel snarls, "Leviathan, you won't get much done after what I did to the Other or the rest of the armada that was headed this way. Don't think your boss will be happy."
The god laughs, "Thanos is of no importance. Can't you see they still stand? Once his army of Chitauri crossed into this world they became our slaves." Long, thin silvery strands appear in Loki's hands, "He has lost his army. They are mine."
"No," Gabriel attacks the god using the Grace they share. Loki fights back using his chaos and turns the stolen Grace to scorch the angel's skin. Through the struggle the archangel pulls the infecting Grace out of the god. Gabriel feels Leviathan stretch between them chewing and chewing inside his head, pulling the link closer between them. Before the angel can pull the last bit of tainted power Leviathan activates the enchantment. The archangel yells as he's sucked away and disappears in a flash of white light.
The god feels exhaustion as a heavy weight is lifted. He feels his mind begin to clear as he runs through the gaps filling his memory. Horror dawns on him as he takes in the ruins around him and grey humanoids collapsing outside. He feels weak as a slithering voice in the back of his mind whispers, 'We failed.'
Loki thinks he may have fainted for a few moments, possibly from the pain or the onslaught of memories whirling in his mind. It's too much and it distracts him that he doesn't realize he is surrounded until it's too late. He isn't strong enough to push down the being sharing his mind but even it can't do more than speak using his body.
Leviathan opens the god's mouth smirking, "If it's all the same to you, I'll have that drink now."
A/N: Gabriel's duplicate has a bit of a mind of his own so he can think for himself but Gabriel's feelings run through him. Also, Leviathan!Loki doesn't want to take over this Earth, he wants to destroy it. Destroying one world doesn't bother it since they can always hop to other dimensions, universes, worlds, or whatnot.
*Not sure if this info might be considered a spoiler for The Dark Tower series by Stephen King so you may not want to read this: Hammarskjöld Plaza is a real building (look it up!) and is also mentioned in the series as a location in New York City of Keystone Earth. For fun this Earth is Keystone Earth which means the building would have gotten hit during the invasion and wouldn't that have been messy if it was destroyed?
Edited: 10-30-2013
2nd A/N: I'm still working on Chapter 7d but at this point it'll be posted as a "What if?" one-shot.