Notes
It's a little unclear at the beginning about what favor is. "You view your bond as a curse: 1d4 favor." This feels like my Favor die is a d4, but as I keep reading I think I'm to actually roll the d4 to determine a number of Favor Points.
You might do better to mention the conversion notes at the front, but place them at the back. "See pg 12 for how to convert this to other systems." I say this because you have two readers: one will gladly skip over conversion notes that don't pertain to them and the other will just stop reading. If you can get both of these readers to the back page, you're winning!
I dig the Grimalkin. This setup has a lot of fun and interesting complexities to it. Very cool. Are these Patrons supposed to be physically present?
I think the format could use a bit of clarity. Sections that apply to me and sections that apply to the Grimalkin are all shuffled together, making it just a bit more difficult than it needs to be to parse what applies to my character. Is my character supposed to become fickle? Do I gain slightly acute senses? Will I no longer cross water? I think a little added delineation will go a long way toward making this a clear and fully enjoyable read from the first time someone sees the page.
I like this presentation. It's clean and classic.
This is a great start. I'm into it and looking forward to what comes next.