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*

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

Shooter: *They immediately fired a poison-coated arrow directly to the head*

*you can tell he's crazy but 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

(gotcha. thx)

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."

???: “Hunter? Well, that’s just rude, I wouldn’t say that. More like… *smiles eerily* Liberator.
*he fires off a dagger made of his bone at Stinger, then ducks behind a tree for cover*

Stinger: *He narrowly dodged, slipping it*

Death Gatling: *He immediately began firing, the bullets ripping through trees as though they were cobwebs*

???: *runs in a zigzag pattern attempting to dodge the bullets, he laughs* You guys are pretty tough, huh? So, who do ya work for, that way I know who to “liberate” after I take care of you punks.

Legion titan: [his 20ft chassis hums with ai and his predator cannon's barrel spins] out numbered 8 to 1

Stinger: *He nervously adjusted the grip of his weapon* "Exactly, so surrender."

Legion: predator cannon locked on target [prepares to open fire]

Stinger: *He began spinning his spear at high speeds*

Wild Horn: *He mumbled something to Glasses in the back*

legion: "enemy hostiles detected" [he fires his predator cannon at 3,000 rounds per minute]

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*