I'm a big fan of this series. The characters are unique and well detailed, and there is an incredible amount of story-rich material packed in just a few pages, with a high-quality piece of character art to top all of it off. The "Tweaks" section gives the GM several options to customize the character to his liking.
Seldr is a stargazer and soothsayer, and could possibly have come to your world from another far away. To help Seldr find messages among the stars, this document contains a simple set of soothsaying rules, in case your system lacks them. Beyond that, this product is systemless, so that you can use it with the RPG system of your choosing.