(Boo/Atomic Boo, Goombella, Mario)

You said you'd be nice! Let's get him guys!

Cower in fear!
Atomic Boo is here!
Mess with us
You'll wish you'd just played nice!

Big badda boom!
Gonna bring your doom!
Shoulda let us be
Now pay the price!

Spooky Ghost
Plumber's toast
You'll wish you had brought a Poltergust

Huge and white
Brings ya fright
It's our night!

We are legion
You'll be screamin'
Now succumb to the spirit's schemin'
Standing hairs
You can't bear
Our scares!

Little Boos
Add up to one fat phantom
Nerds who study mathematics
They're most prone to chilling antics!

You will lose
We're way too big to handle!
Spooky specters swirl and sing
Hail thе horror-kami king!

Dare to approach the lair of Atomic Boo

You won't leavе this place unscathed
Now in terror you'll bathe!

Stand up to our horrid heft
You're a fool!

If it's a beating that you crave
That much, we can sure arrange!

Might of 200 Boos
This day, we'll make you rue
Ain't nothin' you can do
We're too thick!
We'll beat ya black and blue
With ghostly jiu-jitsu
Make plumber barbecue
You ain't slick!

I could've sworn I heard them reference a game that hasn't canonically happened yet...

YOU BREAK THE FOURTH WALL ENOUGH ALREADY, COLLEGE GEEK!

Ghosts in a mob
Feeding on your sobs
Striking you in tandem, unionized!

You're good as had
'Cuz we're big and bad!
As for you, we'll cut ya down to size!

You were mean
To our team
Now the boos are gonna make a scene

You were warned
Now we swarm
To do you harm!

Blew your chance
Now let's dance!
We are gonna kick you in the pants
This squad of creeps
Will make you sleep!
You'll weep!

Ghastly ghouls
The Steeple's bourgeoisie!
Listen up, lasagna lover!
Better learn to duck and cover!

You'll get schooled
By our ghostly shrieks!
Mortal souls, your ears will ring
With the wails of the horror-kami king!

Dare to approach the lair of Atomic Boo

You'll be gone within a flash
When we do the monster mash!

Stand up to our horrid heft
You're a fool!

Who we're gonna dunk in the trash
As an Italian hash!

Might of 200 Boos
This day, we'll make you rue
Ain't nothin' you can do
We're too thick!

We'll beat ya black and blue
With ghostly jiu-jitsu
Make plumber barbecue
You ain't slick!

Wait, so are you like-a THE King-a Boo? 'Cause you sort of-a talk like-a him

Actually, all Big Boos talk like this. King Boo's just the one who wears the cr--
AAAAAAARGH!!!
OUR ONE WEAKNESS...
BEING DISTRACTED BY CASUAL CONVERSATION!
EEYAAAAAAAAHHHH!!!

...You meanie!