Roof panels and related structures, and associated systems and methods

A roof panel system for placement on a roof, the roof panel system comprising:

• an eave roof panel;
• and
• a subsequent roof panel,
• wherein each of the eave roof panel and the subsequent roof panel includes:
• a first layer configured to be coupled to the roof,
• a second layer disposed over the first layer,
• shingles disposed over the second layer and arranged in a plurality of rows including a first row and a second row, wherein each of the shingles includes a top portion, a middle portion, and a bottom portion,
• a first plurality of fasteners coupling the middle portions of shingles in the first row to the structural layer and the protective laver, and
• a second plurality of fasteners coupling the middle portions of shingles in the second row and the top portions of the shingles in the first row to the structural layer and the protective layer,
• wherein the top portions of the shingles in the second row do not include fasteners extending therethrough, and
• wherein the roof panel system is configured such that, when placed on the roof:
• the subsequent roof panel is placed above the eave roof panel,
• the second layer of the subsequent roof panel is disposed at least partially over the second layer of the eave roof panel, and
• shingles in a topmost row of the eave roof panel are disposed at least partially between (i) the second layer of the subsequent roof panel and (ii) shingles in a bottommost row of the subsequent reed-roof panel.