This tutorial used a Roxas wig for it's example. However, the same principles can be applied to any spiky wig that isn't HUGE. This is the method I also used for my old Sora wig!
I hope this is helpful for some people. I've had a lot of people asking me to post a tutorial on spiking. So here it finally is! This is the easiest, most simple way to spike. When using a wig that doesn't have a lot of natural lift like a Scruffy or a Punky, there is a different procedure that I use to create spikes. It's much harder, but I might do a tutorial of this in the future. It uses many of the same principles once again, but it is more labour intensive and frustrating.
Anyway, until my next tutorial.