The header was something I wanted to keep similar to the avatar as throughout the branding coherency was important in keeping the branding as professional as possible throughout all forms of online media.In addition I made a change to the blurred background being of the icon Traveller from the Destiny franchise.
YouTube Banner
For the banner I simply used and extended elements from the header on a larger scale in order to provide the for-mentioned cohesion the branding required in order to look professional on all platforms,hence the 16:9 format.
Offline Screen
For Em's streams she wishes to keep her viewers in the know and therefore wants to create branding assets for occasions even when she isn't available and therefore this was created in order to convey the information whilst still maintaining the goal of diversity of the brand.