Important: To calculate average dmg per hit, divide DPS by Rate.

Explaination: DPS displayed already factor in Crit. chance and Crit. dmg and also rate of attack. Rate of attack is irrelevant since invisibility is broken once an attack is made and the spell have to be cast again immediately.... Thats if you want to be invis all the time like a Ninja. So basically we want to know how much each attack does on average.

Sword start to 3:30
Chainsaw 3:30 to 8:30
Gauss Rifle 8:30 to 14:20
Rocket Launcher 14:20 to end

Invis Melee Dmg Bonus: 2.9x
Fully Charged Sting Dmg: ~5x
I'm going to assume every attack is a fully charged sting attack for melee weapons.

Ghidorah Average Dmg: 2985 or 8657 (for invis)
Saw Blade Average Dmg: 5794 or 16803 (for invis)
Springchester Average Dmg: 3785
Destroyer of Realms Average Dmg: 7514

While Saw Blade dmg is high for melee attack, you need to stand still for the full chainsaw animation to finish to deal full dmg. This is always dangerous for insanity 4 difficulty.

Boss fight with Devouring Kamiko:

You basically never have to worry about dying.. Not even at insanity 4 difficulty.

Player Dmg Resist (PDR): +87%
Weapon (WDR): +30%
After Heal (AHR): +30%
Capped at about 90-95%.

Not sure how the cap works but its probably either:
1) A simple cap at 95%
2) Damaged received = (1 - PDR) * (1 - WDR) * (1 - AHR)

So, for my example when my dmg resistance is at its highest I receive dmg = (1 - 87%) * (1-30%) * (1-30%) = 6.37%

So I was receiving about 6.37% of the original dmg amt.

Boss fight with Zilla Mechanoid:

Player Movespeed: +47%
Invis Movespeed: +92%
Total Movespeed Bonus: +139%

This build is good for boss fights for dodging their attacks or for rushing through a stage or a mission very quickly.

Its not very effective when fighting mobs since their attacks are everywhere and too unpredictable.

Note about sting:
To maixmise damage, you wouldn't want to use sting since it gives a 5x dmg multiplier but has to be charged for 3 secs. So its the same as modifying the weapon's Rate to 1.67 which is lower than most weapon anyway. Sting is efficient only when used with invis Ninja build since that gives an additional 2x dmg multiplier.

Wrist Blade start to 5:40
Chainsaw 5:40 to 9:00
Gauss Rifle 9:00 to 13:05
Rocket Launcher 13:05 to end

Player Crit Chance: +30%
Player Bonus Dmg: +348%
Shadow Fury Dmg Bonus: 3.02x

Ghidorah DPS: 1194
Ghidorah DMG: 118.2
Ghidorah Crit Chance: +47%
Ghidorah Crit Dmg: +174%
During Shadow Fury DPS: 3606

Lumberjack's Caress DPS: 1444.8
Lumberjack's Caress DMG: 212.8
Lumberjack's Caress Crit Chance: +37%
Lumberjack's Caress Crit Dmg: +174%
During Shadow Fury DPS: 4363

Springchester DPS: 1059.8
Springchester DMG: 836.1
Springchester Crit Chance: +37%
Springchester Crit Dmg: +174%
During Shadow Fury DPS: 3200

Destoryer of Realms DPS: 1878.6
Destoryer of Realms DMG: 1659.9
Destoryer of Realms Crit Chance: +37%
Destoryer of Realms Crit Dmg: +174%
During Shadow Fury DPS: 5673

Note that the correct DPS data for both ranged weapons are at timestamp 9:32 I edited it in since I forgot to use the "Marksman Soul" amulet while playing.

Chainsaw dmg is higher but requires player to stand still and wait for animation to finish for it to deal full dmg. This can be dangerous at insanity 4 difficulty.

The key point of this build is that even when Superior units are Power Immune, you can have a 100% chance to hit them with your spells.

At insanity 4 difficulty, just standing next to a mob with elemental buff can kill you, due to "Aura Damage". Also, you have no time to go invisible and you actually don't need to... Most of the time.. So get yourself some dmg resistance.

Use upgrades focused on the specific power you will want to use all the time. 1 powerful spell is better than 2 spells. I recommend Grip of Darkness since there's an achievement related to it.

Oh and you should get Serene Mind maxed. The 4 chi per second helps alot. Chi mastery however not so much. I maxed Chi mastery but its not essential.

You will need Jigoku for this one.

1st weapon upgrade: Pick the one that helps you gain fury when fighting a SINGLE Boss/Mob. If you're fighting a crowd, speed was never an issue to begin with. You want to spend as little "time per shot" as possible. Including reload time in the equation:

Time spent per shot: 1 / Rate + Reloadtime / Clipsize

So, you want the above equation to give you a low number. Any upgrade that affects 2 of the above 3 factors above are always worth considering. By the time you get Jigoku, you should have at least one or two such upgrades. Unless if you're unlucky. Do check shop after every mission there's probably one selling.

Explosive Ammo upgrade multiplies your fury gain when hitting a crowd. Do note that you should aim at their feet.. That way even if you missed the explosion will still hit them. If you miss but aimed at their bodies you literally hit nothing.

Dual Wield literally doubles your fury gain. Its important.

Important to consider if you want "Furious Heart". +30% fury means filling up the meter is even faster. However, -30% affects the passive 4 chi per second from maxed Serene Mind. So you can't spam spells all that much anymore.

Lastly, pick upgrades for Shadow Fury in the Power slots section. Duration is the key since you replenish the meter not the time. Longer duration means each point of fury in the meter is now worth more time. This doesn't improve your fury gain but does make very fury point worth more Shadow Fury time.