What to do with a fireplace in the corner of a room?

I think painting it white and adding a mantel would greatly improve the look-https://www.hometalk.com/diy/living-room/fireplaces-mantels/fireplace-makeovers-going-white-29476184?r=1

If it was me, I would paint the fireplace the same color as the wall only with satin, offset some tall decorative shelves to the left corner there with some greenery and neat accessories or a large plant in a decorative LARGE planter. Maybe a tall rubber tree or chiffilera [not spelled right] depending on lighting. You need something to pertrude from the corner to balance out with the fireplace. A large painting over the fireplace, maybe a watercolor and some votives to reflect the colors in the painting across the mantle would be great . Avoid getting too busy. Keep it clean and airy. Good luck!!!

http://blog.schneidermans.com/design-dilemma-arranging-furniture-around-corner-fireplace/

If you use the fireplace, I would suggest rearranging your furniture to make the fireplace a focal point. Painting it a lighter color will also enhance the visual size of your room. Remove any furniture/clutter you don't use.

Well... this could require some heavy thinking. Since there it is, big and startling, and it isn't going away, why not experiment with playing it up? Before doing anything drastic like painting it, move your existing furniture around in a way that accents the fireplace, like a cozy "place by the fire" corner, possibly grouping two or three chairs at an angle or semi-circle, facing the fireplace instead of into the room. (I'd try three stuffed chairs around a round coffee table, for instance.) You might want to make such "islands" for other roles the room has. For the fireplace, another thing you could do is to dramatize its placement. Look for decor items that reach almost to the ceiling close to the corner of the room, with other pieces lowering in height to the other corner. Don't match up objects by size or shape. For example, pair a large painting on one side with a small clock. A showy mantle could really help.

And looking at your overall style, I'd suggest a paint job for the fireplace in chalk paint that distresses the brick, possibly ivory distressed with a few shades of brown or with a touch of brownish gray.

I just came across this room make-over with a corner fireplace. An excellent way to highlight it yet make it fit in. https://www.hometalk.com/diy/home-tours/s-the-best-room-makeovers-of-2016-26219568?page_num=3

I don't know if you like to entertain a lot but maybe try a bar cart with an array of mirrors and art work above it. I love the rustic look so I would find something with the Rustic wood and metal look and accent the walls with industrial wall sconces along with a mirror and art the goes with it. I would also paint the fireplace. A dove white is always nice or just a white wash. If your a bold and daring kind of person like me paint the wall to be an accent wall. Pick something you like but not to "safe" of a color. If your really feeling bold paint the fireplace Black for a urban rustic look. I have bookcases on ether side of my fireplace and I painted the backs a deep orange and the brick of my fireplace. Also paint the inside of the fireplace with black heat resisted paint to add depth to the inside.

I like the bar cart idea and i would white wash that fireplace. It's easy and you can still see a tad of the brick coming through.