@Background Pony #4554  
Come on, be original…

Queen Celestia: Screw you, you big black fog!  
I’ll kick your butts and your face: a war on two fronts!  
The Führer will crush the Dark Side, like a rap Apartheid!  
I put the ty in the Tyranny! I’m sick on this mic!  
I beat you twice, you sellout! Now you bow down to Mary Sue!  
You call yourself a Dark Lord? You couldn’t even conquer Candy Mountain!  
You’re just a sad, Lord Sauron freak who needs some loving!  
Well, I baked you something; here, pop into my sun!
 
King Sombra: Let me paint you a picture, son:  
Portrait of a bitch after History 101!  
You were stirring up a fears of the Equestrian people,  
Tellin’ the world that the Heroes are evil!  
You overthrown you mama, got ‘em fired up,  
Had a evil sister, got ‘em fired up,  
And when your bunker started getting fired up,  
You put a bow in your mouth and fired up!  
You dumb mother fker, didn’t Discord let you know?  
When you go the Crystal Empire, better pack some fking winter clothes!  
While you’re fighting off Valkyrie,  
I got a million slaves; they die for me!  
My bounty hunters ride for me.  
Yo homegirl, finish this rhyme for me!
 
Rainbow Dash: They call me Rainbow Dash; you wanna mess with me?  
I’ll put my balls in your mouth like rainbow tea!  
I got robot wing, yo! You know I steal the show!  
Cause when I rock a microphone, I—  
(Gotten shot by Queen Celestia)

i think it would be more of jack the ripper and hannibal leter

@Katastrof  
 
I have no love for you who ruined everything,  
my revolution was doing to stop the evil dictators!  
I fought the bondage of classes. The proletariat masses,  
have brought me here to spit a thesis against both of your plotasses!  
Let me start with you there, King Scary Eyes!  
Looking like something out of some 5 year old’s minds!  
It’s hip-hop chowder, red over white,  
Cause the King’s crystals can’t do shit tonight!  
And Celestia, you were supposed to be my right-hoof mare!  
But your loyalty shriveled up like your right hoof, mare!  
Our whole future was bright, you let your heart grow black,  
And stopped the greatest revolution since the birth of Zach!
 
Knock, Knock
 
 
Did somepony say Zach?
 
(I know, I just copied Lenin’s rap and changed a few words. I’m shit when it comes to raps)

Sombra: I should say Ladies first  
But i am King Sombra and you are on my list.  
I had defeat many ponies you now  
but now it’s time for you so lets start the show.  
I am the fear,i am the dark  
and you are that fat like a sun what you have on your butt.  
I have the power to extinguish you like a spark  
I can’t remember how much heads i had cut  
I’m Sombra motherbucker king so  
pack your bags it’s time to your go
 
Celestia:How dare you piece of crap?  
ordered me the princess of tomorrow?  
With that voice you can’t even rap  
I will destroy you and I don’t give a sorrow.  
I will scatter your shadow using my light  
and eat the remains of what you leave behind  
I am the Princess so don’t start to fight  
or i rise the sun and you will end blind.

@Background Pony #ABB5
 
I agree with you.

@Background Pony #5B3A  
That too.

@Background Pony #ABB5  
I think it would be more Blackbeard vs Al Capone.

I think the rap would be similar to Rasputin Vs Stalin