Yeah, I agree with D3struction. Everything has already kinda be done, the only thing you can do is be yourself and give it a personal twist (or suddenly have the most original idea ever, but how often does that happen xD). If your niche is comedy and gaming commentaries, I would say show your personal sense of humor! Do/Say things YOU enjoy and find funny and you are bound to find an audience that has the same kind of humour (don't expect everyone to like your humour though, that's not gonna happen).