The many hairstyles and facial features of the Robin set models are based on the options for the default body build in the beginning of the game. However, when loaded on MMD, the hair and features are mashed together. To get a specific combination, PMX editor is required to delete extraneous material.
Additional hair textures are available for the Robin models, also based on the colors given in-game.
All the Robin models included in the file come with morph sliders for a Levin Sword, a Bronze Sword, and a tome with an interchangeable cover for elemental spells and their upgrades. These are what Robin carried in the fourth installment of Super Smash Bros.
The Readme and Model Use tutorials are PDF files, instead of the usual .txt files. This is because the PDFs come with visual aids in the form of screenshots.
Specifically, the readme has a tutorial on applying the Self Thunder effect, which is included with the zip file, on the Levin Sword.