Hi, I have just written a guide for the medium class here !
As it is a new guide, it is open for comments.
Besides, my own character uses the fiend keeper archetype with its natural weapons with weapon finesse, pirhana strike, and an amulet of mighty fists with the "agile" property. It is a halfling with favored class bonus chosen at every levels.
My stats at level 8 are :
STR 6
DEX 16 (+2 with belt)
CON 14
INT 10
WIS 12
CHA 20 (+2 with headband)
The marshal, hierophant, and champion are the most useful spirits. Sometimes the archmage or the trickster are useful too.
With the marshal at +5 spirit bonus with the fiend keeper and spirit focus(Marshal) in legendary influence, Inspiring call is quite overpowered. I read here that you can increase it with an armor enchantment, be sure I will look for it !