Since everyone is making backstories and movement lists i supposed ill join in to make it easier for char to make the others :
PyroMechanicsBACKSTORY : During the events of Metal Slug 6, when the alliance between the rebel, regular, and martian factions against the Venusians, one martian (later to be known by others as PyroMechanics) left the war effort entirely and cut ties with his previous contacts in hopes to escape the bounty on him by the venusians, to this day, he doesn't know how the war ended or if it even did end, but then again, he doesn't care that much about it, he is a squid-like being, biased off Japan's interpretation of martians.
SPECIAL MOVES :Charge : Charges up the gun, firing a large lazer
Tracker : 1 medium sized lazer that follows the opponent for 5 seconds
Toss : Grabs an opponent, tosses them in the air, and fires an large lazer
Smash-fest : Grabs an opponent and repeatedly smashes them on the ground 5 times, could count as a combo possibly
TAUNT:Truce? : Offers the the opponent his gun, but within 5 seconds points it at him
HYPER : Look Above you : Rides a mini UFO for 10 seconds pulsating a blue color, firing lazers down , if attacked 3 times then the ufo's glass breaks and he is vulnerable to attacks that take 2 times the damage as regular attacks, if you want an example of what flying in the ufo would look like :

let me know if i need to modify anything