Basically this concept requires quite a bit of homebrew and at least level 3 start. In terms of concept it is a Kitsune Ninja. Preferably either for an oriental style campaign or an intrigue style campaign that is open to more weird and wild characters.
Mechanically, it is a multiclass of Swashbuckler (Daring Infiltrator), Unchained Monk (Scaled Fist) and Unchained Ninja or Ninja (Formless Ninja) that then takes the Kakute-Ryu-Ninjutsu Style Feat. He basically runs around with a kerambit as his primary weapon.
Class:
http://www.d20pfsrd.com/classe...ing-unchained-ninja/
Archetype:
http://www.d20pfsrd.com/classe...ninja-ninja-kitsune/
Feat:
http://www.d20pfsrd.com/feats/...-style-combat-style/