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

ha! gonna attack a man as hes hunting? so be it...*he laughs as he pulls up his bear trap mask*

*you can tell he's crazy but no killer*

Death Gatling: "We'll be taking you dead or alive." *He aimed his gun towards them*

Wild Horn: "Make it easy for us, and we'll spare you."

so why are you guys trying to attack me?

Death Gatling: "Don't play dumb “Hero Hunter”!"

Wild Horn: "Put down the explosives."

you really think i kill heros wh did i kill if so?

Death Gatling: "Do you get a kick out of people listing the heroes you've hospitalised or something?"

*Clearly annoyed, he abruptly began shooting*

*he dodges and punches him dead in the chest making him lose his breath and takes his gun* Im no killer

My OC, his name is unimportant, glares at the heroes cruelly. He growls slightly.
“Great, what’s all this about?”

(any info, a description, an image?)

I’ve not an image, but he is a tall, pale young man of about 30, with messy dark green and black hair. He has teal eyes. His outfit is a navy blue and silver priest-like robe that seems constricting at the torso, but loose everywhere else. He wears black fingerless gloves and black leggings. He doesn’t wear any shoes

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*

Stinger:
"Tsk..." *He immediately lunged into the behind of Aqua, aiming to skewer them*

Glasses: *He stayed at a comfortable distance*

*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.

Shooter: *His lifeless corpse collapsed onto the ground*

Death Gatling: *His eyes widened before he yelled* "DIE!" *He immediately activated Death Shower, bullets being launched at absurd speeds as they tore through trees like cobwebs*

Chain'n'toad: *He quickly retreated, not wanting to catch any stray fire*

He turns and charges with a bayonet attached to his weapon shoots the man who is shooting at him in the shoulder evaporating it and the arm along with it as he stabs him in the neck with the bayonet killing the man instantly. As he turns to shoot the frog man who is attempting to escape. “PURGE THE MUTANTS!” as he puts another las round in a target.

Chain'n'toad: *He evaded the attack and launched his kusarigama at their feet, aiming to trip them*

Wild Horn: *He rushed in, and used his Pile Bison with a right hook*

he dodges and puts a bayonet through his visor killing him instantly. he then shoots the toad in the back of his leg making him unable to excape

Updated look.