Another character building guide idea: Secondary Role discussions. The Scout. The Face(of the party). The Healer. The Trapfinder. Making guides that discuss these roles and the various ways they can be filled, and some considerations you want to think about when you take on that secondary role.
For example, a guide on building a Scout PC might state you want a scout to be stealthy, perceptive, mobile, capable of tracking, and able to survive on their own. Then it would give options for how different types of PCs can meet those objectives: Stealth could be the stealth skill, or illusions, or wildshape, or pass without trace, or invisibility... Perceptive could be perception skill, or detection magics, or even fodder as mine detectors (like summoned creatures). Mobile could be high speed, teleportation, flight, etc... Tracking could be survival and certain class skills, or it could be detection magics.