This is just a random idea regarding if characters from Project Vanguard had a Mortal Kombat 1-style dialogues.

Ethan

Vs. Joker

1st

Ethan: "So are you like Robin Hood or something?"

Joker: "Gentleman thief, actually. Crow is more of a Robin Hood."

2nd

Ethan: "I could help you out with your case with Shido, you know."

Joker: "That would be much appreciated, Ethan."

3rd

Joker: "I know Akechi has been trouble for you and your team."

Ethan: "Trouble would be an understatement."

4th

Joker: "We became heroes because we wanted society to be freed from corruption."

Ethan: "Man. I wish other heroes in this world were like you guys."

Vs. Dante

1st

Ethan: "You know your brother's a pain in the ass, right?"

Dante: "When I settle score with him, then you can have him."

2nd

Ethan: "Did you put pineapples in my pizza?!!"

Dante: "Kid, I swear on my mother's name, I would never do that."

3rd

Dante: "So what's your beef with Vergil?"

Ethan: "I have a thing for beating up power-craving assholes."

4th

Dante: "Whoever wins, gets to buy pizza."

Ethan: "Forget buying, let me make one. If I lose that is."

Vs. Ei

1st

Ethan: "God of Weather vs. God of Eternity!"

Ei: "Whoever loses, buys Dango milk."

2nd

Ethan: "You really pull your sword out from your tits?"

Ei: "For the thousandth time, my elemental burst isn't lewd!"

3rd

Ei: "I'm... really sorry about what happened to Naomi."

Ethan: "Thanks. I know she's in a better place."

4th

Ei: "Are my cookings really that terrible?"

Ethan: "You really want me to answer that?"

Vs. Homelander

1st

Homelander: "You're not taking Ryan away from me."

Ethan: "He deserves a better father than you."

2nd

Ethan: "What gives you the right to treat others like shit?"

Homelander: "I can do whatever the fuck I want!"

3rd

Ethan: "Not even Dystopian can match you in being a scumbag."

Homelander: "Don't compare me to that fucking villain!"

4th

Homelander: "After I'm done with you, I'm gonna flash fry those shit friends of yours!"

Ethan: "You even think about touching them, I'll feed you your own heart."

Vs. Springtrap

1st

Ethan: "I'm sending you back to hell, Afton!"

Springtrap: "I always come back!"

2nd

Ethan: "Hey there, crackhead Bug Bunny."

Springtrap: "Comparing me to a cartoon is the worst mistake you'll ever make."

3rd

Springtrap: "Why are you getting in my way?"

Ethan: "I don't know, because you killed kids including yours?"

4th

Springtrap: "Ever considered getting springlocked?"

Ethan: "Ever considered getting electrocuted?"

Vs. Reze

1st

Ethan: "If you really wanna stay here, you better cause no trouble."

Reze: (giggle) "I'll do my best."

2nd

Ethan: "I'm not that easy to beat, Xenomorph girl."

Reze: "Why does everyone keep calling me that?"

3rd

Reze: "Do you like city mouse? Or country mouse?"

Ethan: "Hmm... maybe both, I guess."

4th

Reze: "Care for a little round?"

Ethan: "That sure sounds like a... Bomb. Hehe."

Vs. Adam

1st

Ethan: "I'm not letting you touch a hair on Charlie."

Adam: "You really wanna die for little slut like her?"

2nd

Ethan: "Your ex called. She wants to beat your ass until nothing's left of you."

Adam: "Oh yeah!? I'll give you a beatdown, you cocksucking prick!"

3rd

Adam: "Yeah! Heaven 1, Earth, 0, bitches!"

Ethan: (sighs) "Ancestor of all humans, ladies and gentlemen."

4th

Adam: "Some punk shot out of shitbag's dick don't get to judge me!"

Ethan: "This coming from an angel who acts more like a demon?"

Vs. Itadori

1st

Ethan: "I can tell Gojo trained you up nicely."

Itadori: "I know right! Now I can use Black Flash six times a day!"

2nd

Ethan: "Did you and Todo really just said you liked Rachel's ass?"

Itadori: "We thought it was a compliment!"

3rd

Itadori: "Blegh! Sukuna's fingers taste terrible!"

Ethan: "So it's not finger lickin good?"

4th

Itadori: "Ethan... if Sukuna really do take over me and-"

Ethan: "We're not gonna let that happen."

Vs. Soldier Boy

1st

Ethan: "How is it that you're a good fighter, but a shitty person?"

Soldier Boy: "I'm just not a fucking pansy like you."

2nd

Ethan: "Ever considered getting a therapy, old man?"

Soldier Boy: "I don't have shellshock, so fuck you."

3rd

Soldier Boy: "Kid, you really think you're strong?"

Ethan: "I'm not wearing a cape, so that's an upgrade."

4th

Soldier Boy: "Your old man is a fucking villain?"

Ethan: "I don't wanna hear that from someone whose son is a psychopath."

Vs. Thalia

1st

Ethan: "Why is your dad always have to be a prick?"

Thalia: "He's always been like that."

2nd

Ethan: "Wait, so is Artemis really-"

Thalia: (sigh) "A virgin? Yes."

3rd

Thalia: "Father says you stole his lightning bolt, did you have anything to do with this?"

Ethan: "For a prank? Yes. For world domination? Hell no."

4th

Thalia: "Lady Artemis is still pissed about what happened in Olympus, you know."

Ethan: "Wow, did not know goddesses can be on periods."

Vs. Dorothy

1st

Ethan: "How's it hanging, Doro?"

Dorothy: "Not you, too, Ethan! Damn you, Red Hood..."

2nd

Ethan: "An angel and a goddess together sounds badass, don't you think?"

Dorothy: "It sure does, Commander."

3rd

Dorothy: "The Ark abandoned us... and lost many of our friends..."

Ethan: "If you need someone to stop them, then I'm with ya."

4th

Dorothy: "Why did Chatterbox surrendered to you easily?"

Ethan: "Hehe. That turtle chickened out after I turned Nihilister into a scrapheap."

Henry

Vs. Denji

1st

Henry: "You did a good work with Katana Man back there."

Denji: "I crushed his balls like breaking eggs!"

2nd

Henry: "Fighting to grab Makima's chest isn't really a noble cause."

Denji: "But it would feel so good, man!"

3rd

Denji: "Come on! I just wanna grab Alice's huge boobs!"

Henry: "Do not let her hear you say that."

4th

Denji: "Did you really kicked the Gun Devil's ass?"

Henry: "Even its bullets cannot penetrate my chains."

Vs. Marian

1st

Henry: "The Raptures are nothing compared to my magic."

Marian: "Magic? It's... incredible!"

2nd

Henry: "Keep a close eye on Syuen. That woman cannot be trusted."

Marian: "Our last commander also said the same thing last mission."

3rd

Marian: "Thank you, Hexmaker. For the bandage."

Henry: "It's Henry, Marian. And yes, you are welcome."

4th

Marian: "You really won't abandon us?"

Henry: "You and other Nikkes are living beings. Not weapons."

Vs. Invincible

1st

Henry: "I heard Cecil is interested in my magic."

Invincible: "Woah. That's supposed to be magic?!"

2nd

Henry: "I did not know you had a brother."

Invincible: "Oliver's a... special case."

3rd

Invincible: "Think I'll be strong enough to beat my dad one day?"

Henry: "First, you must learn to master your powers."

4th

Invincible: "So how does magic works in your world again?"

Henry: "Instead of explaining, allow me to demonstrate."

Vs. Geto

1st

Henry: "This revolution of yours will be doomed to fail."

Geto: "I just wish to look out for my fellow sorcerers."

2nd

Henry: "What would Amanai and Haibara would think seeing you like this?"

Geto: "Don't you dare bring up their names!"

3rd

Geto: "Just another monkey trying to test my nerves."

Henry: "I am no monkey, Geto."

4th

Geto: "That is some impressive technique you got there."

Henry: "The same can be said for yours, I'll admit."

Vs. Aether

1st

Henry: "You would forsake your sister for those monsters?"

Aether: "The Khaenri'ah must be avenged!"

2nd

Henry: "This unknown god needs to be destroyed."

Aether: "That is something only we can do, not you."

3rd

Aether: "Don't you understand? The Abyss needs to destroy the Heavenly Principals!"

Henry: "Yes, but at what cost?"

4th

Aether: "Why won't you let me seek my sister?"

Henry: "Because Lumine will not approve of what you have become."

Joshua

Vs. Dimitrescu 

1st

Joshua: "How could you support Umbrella's actions?"

Dimitrescu: "They are good friends of Mother Miranda."

2nd

Joshua: "I wasn't trying to hurt your daughters."

Dimitrescu: "Yet their bodies tell a different story."

3rd

Dimitrescu: "Your blood does quite taste... unique."

Joshua: "It's not meant to be consumed."

4th

Dimitrescu: "My eyes are up here, boy."

Joshua: "Oh! Uh... sorry! You were so tall so..."

Vs. Vergil

1st

Joshua: "Mr. Dante said you fought him since you were kids."

Vergil: "Did he ever tell you that I've won every time?"

2nd

Joshua: "How could you cut your own son's arm?"

Vergil: "I needed his power to restore myself."

3rd

Vergil: "Your power has such potential, yet you waste them."

Joshua: "I want to help people, not hurt them."

4th

Vergil: "If you want the Yamato, you will have to take it from me."

Joshua: "I guess Mr. Dante was right about you being so difficult..."

Vs. Percy

1st

Joshua: "So how are things with your dad?"

Percy: "Pretty good, actually. We fought a Kraken together."

2nd

Joshua: "You can control poison too?"

Percy: "Yeah... we... don't talk about that."

3rd

Percy: "I'm sorry about how you got your powers, man."

Joshua: "It's fine. I've already moved on from it."

4th

Percy: "Chiron said you might be a good doctor at our camp."

Joshua: "I would love to help you guys out in need."

Vs. Maki

1st

Joshua: "What your family did to you was unforgivable."

Maki: "They're soon gonna get what's coming to them."

2nd

Joshua: "I was hoping we get to train together."

Maki: "Just try not to get your ass flat on the ground in a second."

3rd

Maki: "You wouldn't happen to be related to Kamo, are you?"

Joshua: "My powers are from genetic mutation, not Cursed Technique."

4th

Maki: "So I heard you're getting along with Inumaki."

Joshua: "He's really been helpful around here."

Vs. Fredbear

1st

Joshua: "I'm... so sorry what happened to you guys."

Fredbear: "We can't rest until we find the man behind our slaughter."

2nd

Joshua: "You guys can't just murder random security guards!"

Fredbear: "We know... We can't control it..."

3rd

Fredbear: "Is being a superhero fun?"

Joshua: "Sometimes, but often its more of a job than a hobby."

4th

Fredbear: "I just wanna go home..."

Joshua: "We promise we'll save all of you."

Vs. Atom Eve

1st

Joshua: "You can really rearrange matter?"

Eve: "That's only the tip of the iceberg."

2nd

Joshua: "Are my powers really scary?"

Eve: "I mean, you can heal people with that, so not really."

3rd

Eve: "I got my powers from an asshole's experiments."

Joshua: "Yeah. I know that feeling."

4th

Eve: "I still can't believe Rex cheated on me."

Joshua: "You did a good thing letting Monster Girl beat his ass."

Rachel

Vs. Childe

1st

Rachel: "You really should just ditch the Fatui."

Childe: "I just hope I can. But will the others accept me?"

2nd

Rachel: "Is Teucer doing good?"

Childe: "I kept in touch with him, so I'm sure he's alright."

3rd

Childe: "Did you really beat Signora to a pulp?"

Rachel: "I made that butterfly whore my bitch."

4th

Childe: "We should really keep doing this to get stronger!"

Rachel: "Took the words right out of my mouth!"

Vs. Striker

1st

Rachel: "It's gonna take more than some leads to take me down."

Striker: "Who said these were made out leads?"

2nd

Rachel: "You better stay away from Octavia, you hear?"

Striker: "Don't blame me, blame her dear mother."

3rd

Striker: "Now what's a sweet thing like you doing in Hell?"

Rachel: "You should save that for Alice, not me."

4th

Striker: "I never miss my shots."

Rachel: "Tell that to Blitz and Moxxie."

Vs. Zhongli

1st

Rachel: "Sup, Long Dong Zhong?"

Zhongli: "I would appreciate if you do NOT call me that."

2nd

Rachel: "Did you really just shot a meteorite at the Hilichurls?"

Zhongli: "It is the only way to have order."

3rd

Zhongli: "Osmanthus wine tastes the same as I remember..."

Rachel: (groans) "Let me guess, you wanna know where who shares your memories?"

4th

Zhongli: "I hear that you are having a problem with Focalors."

Rachel: "For someone who is a God, she's such a pain in the ass."

Vs. Starlight

1st

Rachel: "Are you Supersonic still together?"

Starlight: "We are... on and off time to time."

2nd

Rachel: "I'm gonna make that fish fucker drown in his blood for what he did to you."

Starlight: "Just at least make sure he's barely alive."

3rd

Starlight: "Did you really punched Homelander?"

Rachel: "That shithead was really getting on my nerves."

4th

Starlight: "So God really did send you to our world?"

Rachel: "The Big Man upstairs? He sure did."

Vs. Emiya

1st

Rachel: "Fist vs sword. Now that's sounds fun, don't you think?"

Emiya: "Aren't you worried you might cut your hands?"

2nd

Rachel: "Just admit it, Shirou. You and Sakura really did it?"

Emiya: "That's private, Rachel!"

3rd

Emiya: "I am the bone of my sword...!"

Rachel: "Hold up, the bone of what now?"

4th

Emiya: "How can you guys be so calm after killing criminals?"

Rachel: "We only give sympathy for those who regret being bad."

Alice

Vs. Power

1st

Alice: "Power, sweetie. If you behave, I'll buy you a hamburger."

Power: "Two cheeseburger! No vegetables!"

2nd

Alice: "Why did you lie about stealing Ethan's food, Power?"

Power: "Devils do not lie! It is only humans who do!"

3rd

Power: "I have to find my Meowy!"

Alice: "If you don't hurt others while doing so, I will help."

4th

Power: "Bow before my might, human!"

Alice: "That's cute, but too bad that I'm not a human."

Vs. Gojo

1st

Alice: "Are you ready to face off against Sukuna?"

Gojo: "Don't worry, I'm the strongest."

2nd

Alice: "I wonder if your Domain Expansion works on my pocket dimension?"

Gojo: (Laughs) "Opening a dimension within another dimension? Challenge accepted!"

3rd

Gojo: "You know I'm really thinking about killing my higher ups."

Alice: "Those geezers again? We won't bother if you do."

4th

Gojo: "Has Megumi have been training well?"

Alice: "Henry's been whipping him up to shape."

Vs. Akechi

1st

Alice: "If it isn't Shido's little weapon."

Akechi: "Don't you dare call me his weapon!"

2nd

Alice: "Robin Hood and Loki. Which one is your favorite?"

Akechi: "The one that slaughters my enemies the most!"

3rd

Akechi: "All I ever wanted was to see Shido fall."

Alice: "But was betraying your friends worth it?"

4th

Akechi: "You still think Joker's better than me?"

Alice: "He has friends and better ideal, you don't."

Vs. Battle Beast

1st

Alice: "Brute strength won't be enough to beat me."

Battle Beast: "Keep telling yourself that, little girl."

2nd

Alice: "Why are you helping us defeating the Viltrumites?"

Battle Beast: "I only seek to see if they are strong to fight me."

3rd

Battle Beast: "You have proven to be worthy of fighting me, Arisa."

Alice: "How flattering, Thokk."

4th

Battle Beast: "Finally, the chance to test the Dyclonians' mettle."

Alice: "A chance you will only experience once."

Vs. Scaramouche

1st

Alice: "Miko told me that you were a living puppet."

Scaramouche: "I am no puppet!"

2nd

Alice: "Hello there, Kuni."

Scaramouche: "Don't ever call me that!"

3rd

Scaramouche: "I will make Dottore suffer for what he has done to me!"

Alice: "That is something we can both agree on."

4th

Scaramouche: "Just what do you expect me to be without the Fatui?"

Alice: "I don't know. Maybe a... Wanderer?"

Vs. Nico

1st

Alice: "I heard you can talk to the dead."

Nico: "I can do way more than that."

2nd

Alice: "Is Hazel doing well back at Jupiter?"

Nico: "She is. I heard she's the Praetor at her legion."

3rd

Nico: "So are you really an alien?"

Alice: "Yes, and not the one with grey skin and big head."

4th

Nico: "My father's pretty much pissed because you guys cheated death all the time."

Alice: "Tell him to wait about... probably thousand years."