I shall "try" to remain impartial throughout this process...cause it's "your" build. I'm just the vehicle. 
  As to "fighter-vs.-others)...A Model #12-6", as I have shown does "not" have the double hilt. It would make a decent all-around user.
 A #7, in either blade length, would be excellent as well and (although it would use up 1 option) can be had  with the #6 blade grind, making it more "surgical" for kitchen/refined work.
 The #22 I posted last just has sooo much standard equipment that it could really be customized (like in a "build") it would serve us well. I posted it as the stainless, nickel silver, thumb notches, crow's beak butt cap are all standard..."& I also posted it as someone referred to a preference of a 3/16" stock knife...
  For all 3 posted....just sayin'...
ITSUP 2 U,
Capt. Chris