Here are some more...

Shot your Mouth Up
Combination: Inferno Mark II + Shotgun X Mark II

Item Rarity: Mythical
Level: 30
Weight: 50
Cost (SuperMech Coins/Tokens): Can only be obtained from Silver or Gold Item Boxes
Damage (Physical/Explosive/Electric): 50-125
Resistance Drain (Physical/Explosive/Electric): 3
Knockback/Pull: 2
Range: 2
Usage Limit: Unlimited
Energy Required: 0
Energy Drain: 0
Heat Produced: 20
Heat Generation: 40
Ammunition Usage (Bullets/Rockets): 15
Projectile Type: Shotgun Shells
Projectile Amount: 4
Projectile Colour: Red

This one came out a little rough, the pixels behave funny when you rotate something in MS Paint by 45°. I might redo it.

Update
I found a way to rotate images in GIMP, not to mention it turned out a lot more smoother this time around.

Lizard Licker
Combination: Inferno Mark II + Deep Drain

Item Rarity: Mythical
Level: 30
Weight: 100
Cost (SuperMech Coins/Tokens): Can only be obtained from Silver or Gold Item Boxes
Damage (Physical/Explosive/Electric): 30, 30
Resistance Drain (Physical/Explosive/Electric): 3, 3
Knockback/Pull: 0
Range: 1-4
Usage Limit: 2
Energy Required: 25
Energy Drain: 50
Heat Produced: 25
Heat Generation: 50
Ammunition Usage (Bullets/Rockets): 0
Projectile Type: Fire/Charged Plasma
Projectile Amount: 1/2
Projectile Colour: Red/Blue

Unlike most weapons, the lizard licker is unique in the fact that it is both an explosive and an electrical weapon. Heaters and Energy Leaches enjoy!

Stats are subject to change due to balancing, with the expection of Joke Items.