That sofa is more traditional in shape, while the chair is super modern. They definitely don't go. I'd also be wary of trying to do multiple leather pieces because mixing leather is hard. For cohesion, you need to match the style and shape of the sofa when picking accent chairs.

So fabric would be a better choice? Wwhat about color wise? Any chair ideas that swivel? He is always pulling a chair from the dinning room to be close to the TV when playing video games so having chairs that turn is a necessity.

Can you take a few pics of the room and post them? It's hard to visualize, and that makes it difficult to give ideas.