Some more NPC specific info.
Curilla acts much like Excenmille, using Flash and Sentinel, but seems to use better weaponskills; Swift Blade seems the most common.
Nanaa acts like a THF (should be tested whether she has Treasure Hunter or not). She seems to prefer Dancing Edge and King Cobra Clamp (her special WS from the mini expansions).
Ayame acts like a SAM, but doesn't use any JAs that I've seen. She seems to prefer Tachi: Jinpu.
All of them gain stats above 99 based on your item level ( as to just weapon or combined armor, I'm unsure), but their defensive prowess raises much faster than their offense. When summoned with 113-119 gear equipped, they still whiff very often in Kamihr, doing ~50-100 when they do hit. However, they take similar amounts of damage as my DRK with 900 defense and ~10% PDT.