If someone writes them into the game, yes; they're not designed specifically to be NPCs, but they're fully available for authors to adopt and/or adapt into their content.
If someone writes them into the game, yes; they're not designed specifically to be NPCs, but they're fully available for authors to adopt and/or adapt into their content.
Ressa could very well have been an inspiration for Tyros; authors are under exactly zero obligation to follow any and all parts of these sketches even if they want to use them, so there's massive scope for change between sketch and final product.