A basic item of Battle Mechs I liked: Pulse Bomb. So if an opponent in this game trapped me in the corner and I have tracks and 0 energy, i can just say, "Bug off!" and shove him to the other end off the map.
Its kinda like Bully, Push, Back blow etc. but a one time use and pushes them more, and each level increases effect, simmilar to other special items. This item does not have any requirements of bullet, heat, rockets or energy.
Pulse Bomb Level 1
Required Level: 10
Damage: 6-10
Range: 1
Knockback: 5
Uses per battle: 1
Pulse Bomb Level 2
Required Level: 19
Damage: 15-22
Range: 2
Knockback: 6
Uses per battle: 1
Pulse Bomb Level 3
Required Level: 26
Damage: 30-40
Range: 2
Knockback: 7
Uses per battle: 1
Pulse Bomb Level 4
Required Level: 33
Damage: 40-55
Range: 3
Knockback: 8
Uses per battle: 2
Pulse Bomb Level 5
Required Level: 40
Damage 60-70
Range: 3
Knockback: 9
Uses per battle: 2
An Item I thought of was a homing device, which any point of the game, no matter where you are or what your energy is, you could return to the spot where you started at, you only need to buy it once, and its there for the whole game.
Another thing I thought of was a Multi-Missile-Launcher for special item, where it requires everything, but is powerful and has a large range on damage, but has limitted used. It has multi weapon effects has firing effects of a rocket hand/rpg, a machine gun or cylon drone, a red laser, and a blue laser all combined and fired at the same time, at different heights.
There are 5 different Upgrades for it:
Multi-Missile-Launcher Level 1
Reuired Level: 8
Damage: 5-45
Requirements: 3 heat, 3 energy, 5 rockets, 5 bullets.
Range: 4-6
Knockback: 1
Uses per battle: 2
Multi-Missile-Launcher Level 2
Required Level: 16
Damage: 10-60
Requirements: 6 heat, 6 energy, 5 rockets, 10 bullets.
Range: 3-6
Knockback: 1
Uses per battles: 2
Multi-Missile-Launcher Level 3
Required Level: 24
Damage: 20-85
Requirements: 7 heat, 7 energy, 10 rockets, 10 bullets
Range: 3-7
Knockback: 2
Uses per battles: 2
Multi-Missile-Launcher Level 4
Required Level: 32
Damage: 30-125
Requirements: 10 heat, 10 energy, 15 rockets, 15 bullets.
Range 3-8
Knockback: 3
Uses per battles: 3
Multi-Missile-Launcher Level 5
Required Level: 40
Damage: 40-185
Requirements: 10 heat, 10 energy, 20 rockets, 20 bullets.
Range 3-9
Knockback: 3
Uses per battles: unlimitted (not that it can be much more, since of the huge requirements!)
And yeah these are my ideas for special items, enjoy!