[Varyon]

Most of this is rather cinematic, but...

Main Gauche - While there isn't technically a default, I'd allow you to use Combat Fan with Main Gauche (or Knife, but there's less good reason for that) with a Weapon Adaptation Perk. I'd probably disregard the -2 to hit for the slashing attack when used in this way.

Bind Weapon/Disarm - This may require your fan have notches in it, but closing the fan over a blade could effectively bind it, and/or give you increased leverage for a disarm. Treat the weapon as though it were designed for - and used with - Jitte/Sai skill, regardless of what skill you are actually using.

Parry Missile Weapons - The larger surface, as well as the ability to manipulate air currents to some extent (that is, the fact it can be used as a fan), could justify a defense bonus against slow/light projectiles. +1 to Parry arrows/bolts, shuriken, and maybe sling bullets; most thrown weapons are too heavy, and bullets fired from firearms are too fast.

Concealment - It may be possible to make a combat fan more closely resemble the accessory it's based off of, allowing you to carry it places weapons aren't normally allowed (and/or get the upper hand in a fight where your foes think you are unarmed).