Rouge (Tumblr Theme 12)

Responsive template for Tumblr blogs. Fully supports both the old legacy and the new NPF post style. Comes with an in-built dark mode, unnested captions, an updates tab, place for countless custom links, and the option to choose between a sidebar that's either to the left or to the right of the post column.

You can preview the template here (legacy focus, left sidebar) or here (NPF focus, right sidebar).

If you'd like some more information about this template, please read the linked guide.