Your OC can either be mistook for a villain, or a villain

an ambush? how fun this will be! *he seems childish*

(what exactly is your OC? It reminds me of a Doors entity)

Death Gatling: "You're the monster who "hunted" all those heroes?" *He aimed his gun towards them*

Wild Horn: "Surrender before anything gets out of hand."

*I fade into a translucent blue-ish color and look around at them, my hand hovering over the revolver that is at my waist* "your weapons can't touch me, have ever seen a ghost cause you're lookin' at one"

Aquamarine: (imgflip.com/i/a2wz9r) Hi, who are you guys?

Death Gatling: *He fired a warning shot upwards* "Don't play dumb “Hero Hunter”!"

Stinger: "You seem wise. Surrender, and there'll be no fighting."

Aqua: I’m literally like… I think a teenager, I don’t remember.

Gun Gun: "Quit messing around!" *He drew both his guns and fired them simultaneously*

Aqua: woah there pal let’s take this back a notch. I’m not even in my dark world form

Death Gatling: "We'll calm down if you surrender, and if not... You can guess..."

Gun Gun: "You've got 5 seconds!"

Aqua: what happens if I surrender?

Death Gatling: "Life in maximum security prison."

Aqua: then no can do, I kinda have a life *grabs knife out of pocket, then stabs the ground to make a dark fountain*

Gun Gun: *He immediately shot with both guns aimed at Aqua's head*

Aqua: *seals fountain, they can see he dodged the bullet* can we calm down please? *is in 2nd form*

Death Gatling: *He suddenly switched to Death Shower, dramatically increases the gun's firing rate in hopes of catching Aqua off guard*

Aqua: what the? *uses the metal umbrella again*

Death Gatling: *He continued the fire, the umbrella denting significantly, the bullets about to pierce*

Chain'n'toad: *He launched his kusarigama at Aqua's feet, aiming to trip them*

Aqua: *jumps and uses the umbrella as a glider, to then kick the guys guns out of his hands* I won’t… fight…

(using a metal umbrella as a glider?)

Aqua: *fails miserably, it's a metal umbrella* well that didn't go how I planned... but my points still stands

Death Gatling: *His gun was smacked out of his grip, so he grabbed the knife by his thigh and slashed upwards at Aqua*

Shooter: *They fired a flurry of arrows at Aqua*

*uses the umbrella to block the arrows again, and jumps off death gatlings head*

*A dozen arrows suddenly rained from from above as Shooter re-equipped their arrows*

( btw I'm not that well versed in Deltarune's power system :P )

Aqua: *grabs pen and makes an iron umbrella* know this is closer to a fair fight *copies Jevil's face*

Shooter: "Be careful! This guy seems dangerous!" *Poison leaked from the arrows down the umbrella*

Chain'n'toad: "Clearly stupid if they try to beat all of us...." *They launched their kusarigama at Aqua's chest*

Aqua: *muttering* why couldn't they just have magic attacks?

Chain'n'toad: *The kusarigama slammed into Aqua*

Gun Gun: *He shot the ReviveMint out of Aqua's hand* "Don't let them get a moment's rest!"

Smile Man: *His kendama's giant ball was launched towards Aqua*

(images included for visual aid)

Aqua: *jumps up and eats the ReviveMint, making the weapon disappear from his chest* you know, you’re only helping me get stronger by attacking me *points to TP bar on pen* the more of this I have, the more stuff I can make *makes a shield, just before the ball hits him*

Gun Gun: "You haven't launched a single attack. You can't stay on the defense forever." *He reloaded*

Shooter: *He launched a single arrow at Aqua's chest*

Stinger: *He charged in* "Fight back!"

Smile Man + Chain'n'toad: *They retracted their weapons*

Aqua: … *weaves, dodges, and makes more defensive things as the attacks come, obviously refusing to fight*

Death Gatling: "Move!" *He yelled*

*The other heroes quickly got out of the way, and he began shooting out of his intimidating gun, the stray bullets tearing down trees*

Aqua: *starts running towards them, as they draw something, dodging to his best abilities*

Aqua: seriously? I just want to get to school! *makes a ReviveMint*

“I just got here. Why are you trying to capture me I haven’t done anything yet?

Death Gatling: *He fired a warning shot upwards* "Don't play dumb “Hero Hunter”!"

Stinger: "You seem wise. Surrender, and there'll be no fighting."

"Heretics, I refuse to surrender to filth like you mutants."

Death Gatling: "Then prepare to die." *He revved his gatling gun*

Gun Gun: *He fired both of his pistols at once*

The bullets ping off of his carapace armor as he lifts his hell gun to ready aiming it at the man who shot at him. “So, you have chosen yours and theirs demise? So be it heretics.” As the hellgun shoots out a 75 caliber laz shot evaporating his entire upper half and beginning to aim for another target yelling out “FOR THE EMPEROR!!!” As he turned on his heal to bum rush the frog man looking to kill.