I've started working on the animated series. And it's also gonna be called Evil's Raising Project instead (ask @PERFECTIDENTITY she knows why).
The Underground Mecha are the enemy mechs used in arc 1. I won't be providing concept arts for them but here is a list of predicted ones. Some will even have hints provided for what they may possibly look like!
Without further ado, here it is.....remember to tell me which ones you'll be most excited to see!
List of predicted-to-appear in Arc 1 Underground Mecha (the episode predictions may not all be acurate, watch out)
Satori's Cruiser: Appears throughout the entirety of arc 1. Powers include flight, mech/craft storage, turrets and missile launchers over the ship's body, and a robot mode armed with homing rocket turrets on the shoulders, a head laser, drones, particle cannons on each hip, torso laser cannons, several machine guns over the arms and legs, a heat ray from the forehead, and a large thermal sword. It heavily resembles Galaxy from the shmup game Blazing Star.
Akula α: Appear in episode 1, 2, 3 and the final episode. Powers include a ball form capable of encasing itself with energy, flight, a beam machine gun mounted on each arm, a pair of 3-pronged claws with laser cutters in them, a round shield on each shoulder which can be thrown like a boomerang, homing missiles from under the round shields, a capture cable built into each shield, a 3-barrelled missile pod in the torso, a single-use needle-like missile launched from the back which can stick to targets, and an energy gun. Their name means shark in Russian, which is rather ironic as they do not operate in water.
Akula β: Appear in episode 5 and 6. Powers include flight, sharp claws, and a laser cannon in the torso.
Radox ζ: Appears in episode 3. Powers include flight, a corrosive burst of acid launched from the abdomen, 4 tubes in the torso which fire a foam-like solution, a green laser fired from each gun on its shoulders, tar from the front horn, a flamethrower in the mouth which can light up its own tar, an electrical grappling hook in the torso, blades built into its arms, an acidic shotgun, and a detachable jet-like head armed with energy guns.
Aruda F9: Appears in episode 4. Powers include flight, a missile battery in the torso, machine guns on the sides of the head, homing missiles from each hip plate, shoulder and leg fin, missile launchers in its palms, explosive arms which can detach from it and latch onto opponents, a double-barrelled energy gun on each hip, and launchable back wings.
Serenade δ: Appears in episode 6. Powers include flight, a pair of remote-controlled hands with finger machine guns, extending tentacles from the gut, eye beams, extending spikes from the finger machine guns, torso spikes, a boomerang on each shoulder, disc bombs from the back, and self-destructing. It heavily resembles Buro from the rhythm game Muse Dash.
Joint X-66: Appears in episode 7. Powers include levitation, an electric cage mounted on each side of the body capable of flight, 6 arms with claw-like scythes capable of conducting energy, torso missile pods, forehead beams, a machine gun on each "shoulder", a rotary cannon in the lower half, emitting electricity from a panel in the abdomen, and a parabolic dish on its back which can charge up energy to fire a deadly beam.
Tortilla: Appears in episode 8. Powers include high jumping, a pair of revolvers, an electric tentacle in the right wrist, an acidic gas from the mouth of the skull-like head, a laser blaster in each knee, eye rockets, cluster bombs from the torso, a buzzsaw from each pectoral, and agility.
Drillga ε: Appears in episode 14. Powers include burrowing, a drill tank mode, shoulder cannons, missile launchers in the torso, a missile pod in each hip and knee, drill bombs in the abdomen, tank treads in the forearms capable of constricting and being used like chainsaws, a head drill, dual machine guns in the mouth, and a drill-like lance stored in the back. It heavily resembles Drill Baron from the mecha anime Brave Fighter of Sun Fighbird.
Hellsparrow γ: Appears in episode 15. Powers include flight, a bazooka, laser guns in the torso, chained back wings which are sharp enough to be used as a flail, a pair of machine guns in the head, and a tail boomerang.
Hunterbot: Appears in episode 16. Its only known power is a machine gun on each shoulder.
Lugiel Ω: Predicted to appear in episode 20. Powers include flight, dividing itself into trucks, launchable fists, a machine gun in each finger which fires explosive bullets, gatling guns in the torso and shoulders, missiles from the back wings, a chainsaw in each arm, mouth cluster bombs, foot wheels, a chained mace in the abdomen, and a minigun. It heavily resembles Megas XLR.
Satsuma: Predicted to appear in episode 20. Powers include a railgun, grenades, and a laser gun in each forearm.
Danchel λ: Predicted to appear in episode 23. Powers include speed, missiles from the lower half, a spear, a shield with a machine gun built into it, cuff-like claws launched from the shoulders, a beam from the horn, chains from the torso, a tail capable of emitting electricity and constriction, and spikes on each foot. It heavily resembles a centaur.
Vortex: Predicted to appear in episode 26. Powers include flight, a carrier plane form which resembles a warthog plane, a machine gun on the plane head, finger machine guns, a fan in the torso which fires powerful hurricanes, homing missiles from each shoulder and hip plate, a shield on each arm, an automatic rifle mounted with a grenade launcher, and a Chinese sword.
Asuka: Predicted to appear in episode 27. Powers include swimming, a submarine form, 2 electric whips in each arm, a laser from the abdomen powered by a large fan, torpedo launchers, antenna beams, wing bombs, mines released from each thigh, and a forehead machine gun.
Moha-12: Appear in the penultimate episode. Powers include hovering like the Doms from Mobile Suit Gundam, a shoulder cannon, a thermal knife in the left wrist, a bazooka, a machine gun in each hip, and grenades. Okuu's unit also has a shield and a red laser sword, and also a pair of rear cannons and wings with homing missiles.
Elbaroich: Appears in the penultimate and final episode. It is Satori's ultimate creation and personal mech unit armed with a Chinese sword, a shield with a 3-barrelled cannon, an electric whip in the left arm, missile launchers in the shoulders and back, a flamethrower on each hip, kneecap energy bombs, a boomerang-like horn, helicopter-like drones, and a powerful laser in the torso known as Collective Consciousness.
Gurkha: Appears in the final episode. Powers include space flight, mines, space torpedo launcher arms, electric tentacles from the arms, a torso flamethrower, and the same needle-like missile as Akula α from a catapult on the back.
List of predicted-to-appear in the other arcs
Marsvesta T4: Predicted to appear in Arc 2. Powers include a wheel mode and a pair of laser cannons.
Sparkhammer V3: Predicted to appear in Arc 2 (same episode as Marsvesta T4). Powers include helicopter blades for flight, shoulder missile launchers, a double-barrelled cannon on each shoulder, a claw-like sword on each arm, a flamethrower in the torso, spinning tail blades, capture cables in each finger, and a gatling gun in each kneecap..
Diesel Hussar: Predicted to appear in Arc 2. Powers include a diesel train form capable of remote-controlling 5 drones, a machine gun on each shoulder which fires explosive bullets, a 6-tube missile pod in the abdomen, a double-barrelled diesel train-like flamethrower, a machine gun in each forearm, homing missiles from the hip plates, creating holographic duplicates of itself, and foot wheels.
Diesel Hussar Drone 1: Its only known power is a 5-tube missile pod in the torso.
Diesel Hussar Drone 2: Its only known power is a drill for the right hand.
Diesel Hussar Drone 3: Its only known power are a pair of claw hands.
Diesel Hussar Drone 4: Its only known power is a machine gun in each pectoral.
Diesel Hussar Drone 5: Its only known power is a chained flail in the left arm.
Angus U55: Predicted to appear in Arc 2. Powers include a spiked ball form, burrowing, back explosive spikes, a machine gun on each side of its body, and a tail club. It heavily resembles Anguirus from the Godzilla franchise (not to mention it also uses Showa Anguirus roars).
Vortex Kai: Predicted to appear in Arc 2 and Arc 3. Powers include flight, a jet plane mode, a beam machine gun, an electric tentacle in the left wrist, and helicopter blades in the left arm.
Samboss Elbaroich: Predicted to appear in Arc 3. A remodified version of Elbaroich which was developed using technology stolen from the Mecha Empire's Sambossular/Samoa and serves as Satori's personal mech unit. Powers include flight, splitting into 2 units (a helicopter known as the Samboss Chopper and a jet known as the Samboss Interceptor, both of which are armed with missiles and beam machine guns), a cybernetic katana known as the Samboss Tachi, a shield with a minigun mounted in it known as the Samboss Shield, a beam rifle known as the Samboss Rifle, an energy gatling cannon in the torso known as the Samboss Shredder, missiles, head vulcan guns, an energy cannon on each hip, an electric whip in the left wrist, and missiles.