WordPress and Categories with unique headers

well at least for me this is advanced. I have one jewerly site with brands. For now i have fixed number of brands like 10 of them. I want each brand to have its own page with unique header/image/title/logo. When u enter brand landing page you see brand products. Click on read more hows product details page. Problem is that client want later to add himself new category new brand. And brand must be shown under menu and one slider on homepage. What is best way to do it ? What is proper way. So you have main menu -> our collections -> addlers for example. I want to list there all products from Adler but have unique header then other brands. Link is -> https://www.mobilecommz.com/istanawordpress/our-collections/

Thanks a lot