Castile's page

Ki arrow spell? Not exactly efficient but...

I found that reading the flavor text for a lot of the racial archetypes is really inspiring to what a character can be. My current favorite is the scarred witch doctor who gains magical ability through contemplating their pure self hatred while staring at a hideous mask. How hardcore is that?

Hobgoblin also had some interesting flavor text imo. The advanced race book is overall really well written from what I have seen, definitely my favorite book so far.

I actually like the idea of buff limitations, but then again I am a tabletop newbie. It's extremely common in video games these days so perhaps you could take inspiration from that, though it seems you have a pretty good grasp of the concept already. One interesting implementation I've seen (not saying it's good, just interesting) is a static number limitation of buffs that could only be increased by a class specific skill. You would think that it would make that class a mandatory pick for a party but I found it was easily managed by communicating a buff strategy with teammates. For reference the limitation was something like 5 without the skill and 10 with, in a game where a party could easily be dishing out 20+ buffs. Not all buffs are equally useful and I believe this still holds true in Pathfinder. But add together every buff you can get your grubby hands on and it spirals out of control in terms of balance.