So I keep looking at him and can't help but think that he would be better off as a slayer than a rogue/fighter. Has anyone out there done this, or do I have a rebuild ahead of me?
That's what I did. Slayer didn't exist at the time.
Though I made him a URogue 3/Slayer 13 for Dex to damage. I didn't like his original build much. Con as his best stat, but no thought given to tanking? Everything about his character screams "POUND THEM WITH MY FISTS BATHE IN THE BLOOD RIP AND TEAR RIP AND TEAR" as his combat style but he's not built that way at all.
So I gave him Cornugon Smash to go with his Shatter Defenses, and the TWFing Feats.
This is my first attempt at him also a URogue 3/Slayer 13
Barnabas Harrigan CR 15
XP 51,200
Male human rogue (unchained) 3/slayer 13 (Pathfinder RPG Advanced Class Guide 53, Pathfinder Unchained 20)
NE Medium humanoid (human)
Init +9; Senses Perception +20
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Defense
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AC 23, touch 17, flat-footed 18 (+6 armor, +2 deflection, +5 Dex)
hp 181 (16 HD; 3d8+13d10+93)
Fort +17, Ref +18, Will +11; +4 vs. fear
Defensive Abilities danger sense +1, evasion
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Offense
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Speed 30 ft.
Melee +2 short sword +21/+16/+11 (1d6+7/17-20) or
. . +3 short sword +22/+17/+12 (1d6+8/17-20) or
. . unarmed strike +20/+15/+10 (1d3+2 nonlethal)
Ranged +1 double-barreled pistol +21/+16/+11 (1d8+1/×4) or
. . +1 double-barreled pistol +21/+16/+11 (1d8+1/×4)
Special Attacks slayer's advance 1/day, sneak attack (unchained) +2d6, sneak attack +5d6, studied target +3 (3rd, swift action)
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Statistics
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Str 14, Dex 20, Con 20, Int 13, Wis 12, Cha 10
Base Atk +15.25; CMB +17; CMD 34
Feats Accomplished Sneak Attacker, Dazzling Display, Deadly Aim, Double Slice, Greater Two-weapon Fighting, Improved Critical (short sword), Improved Initiative, Improved Iron Will, Improved Two-weapon Fighting, Iron Will, Piranha Strike, Shatter Defenses, Two-weapon Fighting, Weapon Finesse, Weapon Focus (short sword)
Skills Acrobatics +24, Appraise +12, Bluff +16, Climb +9, Intimidate +19, Knowledge (geography) +12, Knowledge (local) +13, Perception +20, Profession (sailor) +20, Sense Motive +20, Stealth +24, Survival +16, Swim +21
Languages Common
SQ combat style (two-weapon combat), favored terrain (water +2), rogue talent (weapon training), slayer talents (combat trick, opportunist, ranger combat style[ACG], ranger combat style[ACG], ranger combat style[ACG], terrain mastery[ACG]), stalker, swift tracker, track +6, trapfinding +1
Combat Gear mariner's eyepatch, potion of barkskin +4 (2), potion of cat's grace (3), potion of haste, potion of invisibility (2); Other Gear howling skull armor, +1 double-barreled pistol[UC], +1 double-barreled pistol[UC], +2 short sword, +3 short sword, bag of holding iv, belt of mighty constitution +4, cloak of resistance +3, glove of storing, ring of protection +2
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Special Abilities
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Danger Sense +1 (Ex) +1 bonus on reflex saves and AC against traps.
Dazzling Display (Short sword) Intimidate check to demoralize can affect those within 30' who see you.
Deadly Aim -4/+8 Trade a penalty to ranged attacks for a bonus to ranged damage.
Evasion (Ex) If you succeed at a Reflex save for half damage, you take none instead.
Favored Terrain (Water +2) (Ex) +2 to rolls when in Favored Terrain (Water).
Improved Iron Will (1/day) Can re-roll a Will save, but must take the second result.
Opportunist (1/round) (Ex) A foe who takes a melee hit from another provokes an AoO from you.
Piranha Strike -4/+8 You can subtract from your attack roll to add to your damage with light weapons.
Slayer's Advance (1/day) (Ex) As a move action, move up to 2x speed (can stealth at -10).
Sneak Attack (Unchained) +2d6 Attacks deal extra dam if flank foe or if foe is flat-footed.
Sneak Attack +5d6 Attacks deal extra dam if flank foe or if foe is flat-footed.
Studied Target +3 (swift action, 3 at a time) (Ex) Study foe as a Swift action, gain +3 to att/dam & some skills vs. them.
Swift Tracker (Ex) Tracking penalties when moving at normal speed or faster are reduced.
Track +6 Add the listed bonus to survival checks made to track.
Trapfinding +1 Gain a bonus to find or disable traps, including magical ones.
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I rebuilt him as a Mysterious Stranger Gunslinger, but then I tend to radically rebuild all of my NPCs so it's not too far out there.