I’m all for making elaborate costumes with armor or animatronics, but costumes can be simple too. For example, take just about any character from Supernatural. Unless you want to dress as one of the monsters the Winchesters fight, you can cosplay as most of the characters by visiting your closet. Dean and Sam Winchester have simple clothing needs so their wardrobe is often pulled from places like Old Navy. You could also go more dapper and dress like Crowley or don a suit and trench coat and be Castiel.
Cosplayer Love Squad went with Abaddon. The Knight of Hell battled Crowley for leadership of hell in Seasons 8 and 9 of the series, and she wears a lot of black clothing. At one point, she wears a t-shirt with a red devil. Love Squad re-created the look by quickly tracing the picture for her shirt and making it, grabbing some black pieces of clothing from her wardrobe, and making a quick latex scar with thick stitches (Abaddon has an incident at one point). It’s simple, but it’s well done.
Photo by Love Squad