Bishoujo Chucky Mc being smaller and friendly, not something you would expect from a Slasher, until you piss the fuck out of her, or worse:

You hurt a child in front of her.

B!Chucky Mc is protective of kids and because of that, they see her as a big sister.

Yessssss!

Ortho and Cheka become attached to Chucky MC! She even goes to the town to sell the dolls she makes in her spare time, taking commissions and special orders for specific children, and all the kids love her!

I imagine she'd get on Leonas ass for not being the nicest to Cheka.

Also, very clever and knows how to improvise! Chucky litterally kills in the most "pulled it out of nowhere" ways, so I'd imagine Chucky!MC just pulls solutions out of nowhere too!

Doesn't like sex (this is a reference to how slashers kill people during sex or after sex or how sex negatively influenced the Slasher for ex. Jason Voorhees. Also could be reference to the Scream rule of the don't have sex if you want to survive a horror movie.)

Is actually good with kids despite their appearances with their masks on

Knows Sign Language (based on the Slasher who don't speak or perfer not to speak)

Keeps a weapon/special item on them at all time

Oblivious to romantic love/affection

Attractive with the mask on and off

Can and will pick up people

Taller than Malleus

Grimm is always on their shoulder or head.

Head tilts a lot, but the others thinks it's cute

Oooh! I like this!!!

Slasher MC being Asexual or sex repulsed would be on brand. And idk where I've heard this, but don't a lot of killers have kids/are good with kids- especially if they want to lure victims in?

Sign language for when they just... don't feel like talking. And taller than Malleus? Slasher MC would be terrifying no matter how good looking they are XD

You could also model Slasher MC depending on your favorite slasher! Like a Freddy!MC who takes frequent naps and could even be a burn survivor? Maybe a Chucky!MC who carried a doll with them everywhere? Donna Beneviento