A/N: Credit to Renowned Wolf for this scenario and script

In Ireland a drug dealer, who's dressed like a douchebag, is running down back alleys being pursued by you in your human disguise. The dealer tries to block your way, but to no avail, as you bulldoze your way through everything. As the dealer runs, she turns the corner only to run into Millie.

Millie: Hey, there!

She pounces on her, getting a couple of cuts and stabs with her knife, but the dealer manages to shake her off and continue down the alley to her hideout now with both you and Millie pursuing her.

Millie: Throw me!

You pick up Millie and spin around, throwing her at the dealer where she latches on and stabs her in the shoulder, causing her to cry out in pain and crash through the door of her hideout where she's greeted by Loona in her human disguise.

Loona: Hey, loser.

She kicks the dealer in the gut, then grabs her by the throat and choke slams her into the floor before picking her back up before bitch slapping her, causing her to fall back into you who punches her across the jaw, knocking out several teeth. 

The two of you give the dealer a double hellhound ass beating ending with you throwing her through the door of her drug lab. The dealer tries to get up but is held down with your foot on her throat.

Dealer: What do you want, money, drugs?

Loona: It's not about that, bitch.

Dealer: What?!

Y/N: This is payback for all the lives you ruined, you even sold to kids.

Millie: Hey, Y/N.

Millie shows a dozen syringes full of the dealer's drugs.

Loona: Lookie what we've got here.

Millie: You thinking what I'm thinking?

You pick up a syringe and look at the dealer, who now has a horrified look on her face as you inject each one into her. The dealer jerks around and convulses as she suffers the effects of all the drugs as Moxxie and Blitzo arrive. 

Blitzo: Who the fuck said you could kill her without me?!

Moxxie: What did you do to her?

You: Gave her a taste of her own medicine.

Loona: Guess no one told her not to get high off of her own supply.

The dealer stops moving as she lays down foaming at the mouth and blood coming out of her nose, finally dead.

Moxxie: That didn't take as long as we thought.

Millie: We've got extra time, what should we do?

You look outside and see a St Patrick's Day celebration going on and decide "eh, fuck it". As you head out, Blitzo notices something shiny in a hole in the wall. You sneak around and make their your over with the Imps stealing leprechaun costumes to blend in, Blitzo is even carrying a pot of gold, with you stealing a green coat.

Loona steals a green bolero jacket with a gold four-leaf clover on the back and rolls the sleeves up.

Having gotten all dressed up, IMP partakes in the festivities with Millie and Moxxie playing games, Blitzo examining the pot of gold, and you and Loona getting a couple of beers.

Meanwhile, back at the dealer's hideout her thugs return and find her dead.

Thug: Oh, shit!

Another thug goes to check on the dealer and confirms she's dead, causing the others to panic and argue amongst each other until one of them gets everyone's attention.

Thug: Where the fuck is the gold?!

The arguing is brought to a halt as the dread sets in.

???: I'd like to know that as well.

The six thugs all jump and turn to see a leprechaun.

Thug: Oh, fuck! We-

Leprechaun: We had a deal. You protect my gold and I assist your little enterprise.

Thug: We know, but look what-

Leprechaun: No excuses, now you're going to help me find it.

Another of the thugs speaks up.

Thug 2: Oh fuck this sh-

They're cut off as the leprechaun uses magic to hold all of them in place. When he releases the thugs they all have bright green eyes having been put under mind control.

Leprechaun: Now let's get my gold.

Back at the festival Blitzo is causing mischief and being overprotective of the pot of gold, Millie and Moxxie are still playing games, and Loona and you are competing to see who can chug beer the fastest. 

Loona manages to win triumphantly slamming down her pitcher just before you do and gives you a cocky smirk, leaving you dumbfounded before laughing it off and Loona leaning in giving you a kiss. Unfortunately this moment is interrupted by people yelling. They turn and see Blitzoand an old man fighting over the pot of gold.

Blitzo: Hey, get your filthy nut scratcher hands off the gold, you potato munching prude!

Old man: You have no idea what you're fucking with you... What are you, an imp?

Blitzo: Uhh....no.

The little skirmish continues with Blitzo fighting off the old man and managing to knock him out with a bar employee carrying the old man outside.

Blitzo: Yeah that's what I thought!

Y/N & Loona: What'd you do this time?

Blitzo: Hey, I was minding my own business when some crotchety asshole came up and tried to steal my gold!

Loona: Why would someone want to steal costume go-

She cuts herself off as she and you notice the pot of gold Blitzo has is real.

Y/N & Loona: WHERE THE FUCK DID YOU GET A REAL POT OF GOLD?!

Leprechaun: I believe I have the answer to that question.

All of IMP turn to see the leprechaun accompanied by his mind controlled thugs who draw their guns and open fire causing everyone to scatter and duck and cover while you and Loona turn back into your Hellhound forms.

Moxxie manages to get a headshot before having to take cover again before you draw your handgun and charge forward, killing two more thugs before the leprechaun uses magic to throw objects at you and cause mischief like flashes of fire, glitter, and even bubbles.

A/N: FUCKING BUBBLES!

Two of the remaining three thugs jump on you, who tosses one off to be caught and mauled by Loona, while Millie and Moxxie jump on the third thug and you rip the head off the first thug all the while BlitzO hangs back clutching the pot of gold. 

You turn to the leprechaun who just smiles before you swing at him, only for the leprechaun to disappear and reappear behind you laughing. The leprechaun jumps on your back and starts strangling you, causing you to try and slam the leprechaun into a nearby wall, only to disappear again causing you to hit you head on the wall. The others, sans Blitzo, get involved and the leprechaun keeps playing tricks on everyone.

Loona swings at him before he teleports behind her, smacks her on the ass, and disappears again.

Moxxie tries to sneak up him, but he notices and turns the section of the floor Moxxie was standing on into a pool, causing him to fall through.

You try to rush him, though he turns the rest of the floor into ice and you slide across before crashing face first into another wall.

Millie tries to pounce on him to stab him, though he turns her knife into a retractable prop at the last second.

You and Moxxie stand back up and see the leprechaun holding Loona and Millie restrained with magic.

Leprechaun: Return to the hideout with my gold and maybe you'll get your little concubines back in one piece.

In a cloud of green smoke the leprechaun disappears with Loona and Millie.

Y/N: Blitzo, WHERE THE FUCK ARE YOU?!

Blitzo comes out of hiding with a downcast expression and hands the pot of gold to You.

Moxxie: Alright, let's return the gold and get the girls back.

Y/N: Oh no, we're gonna kill this son of bitch.

Blitzo: Fuck yeah, we are!

Moxxie: But how?! He kicked out asses just now.

You hear groaning and see the old man from earlier stand up.

Old man: I might be able to help. Name's O'Grady.

O'Grady leads the three of you to his house where he tells you about how he's been trying to kill the leprechaun for years.

O'Grady: From years of research and failed attempts I've found the only thing that can harm the leprechaun is wrought iron, I've managed to gather enough to make a few bullets and a knife.

He presents Moxxie and Blitzo with the bullets and you with the knife.

O'Grady: This is all I have, so we have to make them count.

Y/N: Let's kill this fucking leprechaun.

Back at the dealer's hideout the leprechaun has Loona and Millie tied up, and is making some advances on them.

Leprechaun: I may end up keeping you for myself.

He grabs Loona's face.

Leprechaun: I've got quite the bone for you.

A/N: In the movie, he really is a perverted little shit.

She shakes off his hand and tries to bite him.

Loona: Just wait you-

The leprechaun smacks her.

Leprechaun: When a dog misbehaves, you have to smack it.

He then turns to Millie.

Leprechaun: Nice to have a woman more my size.

Millie: Oh please, our boyfriend's dick is bigger than you.

Leprechaun: Don't let my stature fool you, I more than make up for it.

They hear you approaching from outside and the leprechaun goes to greet you with Loona and Millie.

Leprechaun: Do you have my gold?

You hold up the pot.

Y/N: You better not have hurt them.

Leprechaun: Nothing too rough. (You growl) Now hand over my gold.

You walk up and extend your hand with the gold.

Leprechaun: Now then-huh?

He jiggles the pot of gold before counting the coins at super-speed

Leprechaun: I'm a shilling short!!!

You duck down, then out of nowhere the leprechaun is struck in the shoulder by a wrought iron bullet making him cry out and bleed green blood as smoke emits from the wound. A zooming shot reveals Moxxie made the shot with a rifle then speaks into a radio.

Moxxie: Target hit, I've only got two shots left.

The leprechaun gets up just in time to see you bringing your knife down and just manages to avoid it, only to be shot in the back by Blitz and in the other shoulder by O'Grady, again the wounds produce smoke.

O'Grady: Remember me, you diminutive fuck?!

You get a few slashes in with the wrought iron knife, which is glowing hot from contact with the leprechaun, while the others shoot the remainder of their bullets.

Moxxie: (radio) I'm out.

Blitzo: Me too.

O'Grady: Same here.

The leprechaun is on the ground, writhing in agony, as you get ready to deliver the final blow. Unfortunately at the last second, the leprechaun uses his magic to lift and throw Blitzo at you, making you drop the knife, before he gets up and levitates the pot of gold to his hand, then turns to you and uses magic to hold you in place.

Leprechaun: What shall I-

He's cut off as the wrought iron knife stabs him through the back and out the front with Loona holding the handle. She backs off as the knife glows red hot and sets the leprechaun on fire then as he screams in agony he's fully engulfed in flames before finally exploding.

Loona: How's that for misbehaving? You little green shit.

You come up and hug both Loona and Millie.

Y/N: Are you two alright?

Millie: We're fine, baby.

Loona: You of all people should know how tough we are.

Loona & Millie: Now come here.

They pull You into a heated kiss as Moxxie joins the rest of the group.

Moxxie: Is he dead?

Y/N: Fucking dead. 

Moxxie: What do we do with the gold?

Blitzo: Well I think we-

Y/N: We're splitting it.

Blitzo goes to say something but decides against it when he sees the look on your face.

As you split up the gold, O'Grady speaks up.

O'Grady: Thank you, all of you. I've been hunting that bastard for years.

Y/N: It's kinda what we do.

Moxxie: What are you gonna do now?

O'Grady holds up the leprechaun's skull.

O'Grady: Plenty of people would pay to see a leprechaun skeleton.

You laugh at the idea before everyone says their goodbyes and part ways with IMP going back to Hell.