Female gamer / male gamer.
Well, in general, (without trying to be rude), a lot of female gamers like to show of their curves. And that attracts males like crazy. Although, lot of them eventually end up doing something stupid and getting banned.
Now, its up to you which kind of a female gamer you would go for, but if you would just be a general gamer, be genuine, be yourself. Don't force it, don't pretend you like something if you don't and do not scream like a mad monkey for the sillies reasons. It was going fine when Pewdie started, it was even fun watching him, but later on, as he continued doing the same thing, he started forcing it too much. Just because he saw it worked in the past. It took him some time to realize that it would lead him nowhere and his fame would decline over time so he started doing more talking and less playing. I don't follow him that often, but his case was special. After many other youtubers saw his sudden rise, there were so many darn screamers all over the youtube.
Seriously, there is no need for that, just be yourself.
As for the content, it's all up to you. You can play & stream live, you won't be getting that many views as you would on twitch though. So for the videos. You could add different sections. General gameplay with the game in focus and your genuine reactions or comments on certain stuff. You could do reviews as well, have some non gaming content, perhaps a video of you only answering to people and their questions and what not.