How about dark purple. Eggplant?

Or maybe black.

Would NOT paint the walls all that dark or you'll end up with a really weird contrast vibe -- your sofa could look an off white by comparison ... not Goth or Gothic at all.

Instead, to evoke a Gothic vibe without creating a dreary cave vibe, you could paint the walls a medium flat/muted gray -- a shade or two darker gray than your sofa. Then focus on making your other furnishings black. That could include items that are all or only part black such as drapes and throws and area rugs and pillows as well as fabric/vinyl on foot stools. You could also add other black furnishings accessories -- black painted wood and metal:

End tables and coffee tables.

Tray on coffee table or ottoman.

Book shelves.

Picture frames.

Plant stands.

Plant hanging brackets centered over windows.

Black flower pots and hanging baskets.

Black vases.

Black wood decorative boxes.

Lamps with tall then black metal posts --

... but DO use light gray or white shades because the purpose of a lamp is to yield light.

There is no reason you could not add any other color sofa cushions with your black or gray, including teal. You could even look for fabric that is black and teal and hem the top and bottom to create your window treatment.

I had to look up "boho gothic". I think this example that I love and have saved for when I get my nerve up, matches the look you are going far. Look at the other rooms in the house for the light brown walls.

I checked the questions to the designer looking for a paint name. Unfortunately the pro poster was a photographer and not a designer.

I had teal walls and dark brown couch. I liked it. I would go with your color choice.

Don't use Brown paint with a Grey sofa. You could get the warmth of brown in dark wood pieces ( with some pointy gothic arches?).or use Suezbell's black color scheme which would work well with teal and grey. Get your drapes first then color match paint to work with them, the sofa and whatever flooring you have. Walls in a light to mid-tone neutral are the most versatile. Save the dark moody gothic colors for your accents. I love Teal with Grey or Brown but it seems more modern while Burgundy or Eggplant has a more Gothic vibe to me. Of course I am more a fan of High Gothic cathedrals and castles than teens in all black garb.:-)

I know grey is the trendy color of the moment but it will not give you the vibe you are after if you want dark and gothic. Well, not unless we are talking charcoal. I love dark and moody rooms and have a couple of them myself. I can agree with Kathleen Kirchoff, chocolate is not the way to go. OTOH, paint is cheap and easy to change. Have fun with it. Try the chocolate. If it does not work then try something else. Can you post a photo of the room in question? It would also be helpful if you could post a photo of a room you like, an inspiration room.

Boho gothic sounds right up my alley. Off to explore Google and find out what it is all about!

OP, do you have an inspo pic or two and any pics of the house? Pic or link to the sofa? What sort of flooring does it have? Do you want that goth feel throughout or just in a room or two? Do any of the images below read as "gothic" to you? Does Abigail Ahern,Timorous Beasties, or House of Hackney? Off hand, my inclination is always to paint last but OTOH in the right space a shade like F&B Brinjal or Pelt might suit as a moody backdrop for your sofa.

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I love boho, however, am not particularly a fan of gothic. I did find this though, so that you can look a lot of accessories over, and a lot of rooms. It should give you some ideas. I wouldnt use chocolate though, with a gray couch. If you really want it that dark, try charcoal instead. https://www.pinterest.com/lynnmrie/vintage-boho-gypsy-goth/

I am a fan of neither but a touch of boho can work in many instances but goth to me belongs in a bedroom I see nothing goth or boho of the pics posted by Finallyhome and a bunch of fake books on a ll the walls does not make the room either one.I would advise you start some idea books so we can see exactly what you are thinking. My guess is you are young and working on finding your style which BTW we have all done but the trick is to find YOUR style