Those are great choices! 
Alright, I gave the other threads some Motörhead, so I need to “Lemmy up” this place as well. This one for sniper Zer0:
Like a sniper, I’ve got my sights on you
Windscreen wiper, there ain’t no spoiling my view
Silver bandoleer, my profession’s clear
Sharpshooter
Infra red vein, don’t you come out at night
Infra red chain, you’re gonna buy your life
Silver pistol too, with a notch for you
Sharpshooter
You’re the contract, I’m gonna nail you down
I’m the contact, with your final round
And I’m stalking you, and that ain’t all I do
Sharpshooter
And this one for melee Zer0:
Murder I am, you know it was me
I was the one, that you didn’t see
I was the cut, down to your bone
I put you there under that stone
I, I am the blade, I am the dream of the brave
I, I am the knife, I bring grief to your life
I, I am the sword, I am the word of the Lord
Do what you will, I bring you the edge
I am the one to sever your head
I cut so deep, I can cut straight
All depends on the moves you make
I, I am the blade, I am the promise unmade
I, I am the knife, I bring death to your life
I, I am the axe, to stop you dead in your tracks
I, I am the sword, I bring the fear of the Lord
Centuries pass, dust in the wind
I shall remain, shining in sin
The metal I am, the iron you feel
The song of the dead, the chorus of steel
I, I am the blade, I break the oath that you made
I, I am the mace, I am the blow in the face
I, I am the axe, to cut down heroes like rats
I, I am the sword, I do the work of the Lord