I just want to point out that Master of Masks is horrible from a pure optimization standpoint, if you take more than 1 or at most 2 levels. The Faceless mask is actually quite useful (although its use will peter out at higher levels), and if you should pick up a second mask, I'd strongly consider the Gladiator for even more versatility, this one combat-oriented.
I made a level 20 character for a 1 shot game.
Changeling Factotum5/Chameleon10/Master of Masks5
Character was named "Myriad", and had Dissociative Identity Disorder.
The 5 personalities were:
The Noble- NG, High Priest Mask, Combat and Divine Focus
The Mage- CG, Archmage Mask, Arcane and Divine Focus
The Demon- CE, Demon Mask, Arcane and Combat Focus
The Solder- NN, Gladiator Mask, Combat and Stealth Focus
The Beast- NE, Dragon Mask, Combat and Wild Focus
The personalities would switch as a standard action with the Masks, but the Focus's would take 10 minutes to adapt, so sometimes the personality had the abilities of another, and would get real creative. The Changeling body would adapt to match the appearance of the mask. Glammered armor also adjusted in appearance to match the personality.
Caster levels got up to 22 with 6th level spells. Crazy fun character to play.