Choo-choo mfer

Race: Human
Class: fighter (brawler) 4/brawler 11
Traits: Bred for War, Reactionary

Feats:
1 power attack, improved overrun, Bullette charge style
2 Spiked Destroyer
3 Bullette Leap
4 Charge Trhough
5 Combat Reflexes, Improved Unarmed Strike
6 Vicious Stomp
7 greater overrun
9 Shield Focus(Heavy Steel Shield), Guarded Charge
11 Weapon Focus(Unarmed Strike)
12 Weapon Specialization(Unarmed Strike)
15 Greater Weapon Focus(Unarmed Strike), Greater Weapon Specialization(Unarmed Strike)

Class Abilities
1
2 Close Control +1, Bravery +1
3 Close Combatant
4
5 Martial Flexibility, Brawler's Cunning, Martial Training
6 Brawlers Flurry(Two-Weapon Fighting)
7 Maneuver Training +1 (Overrun)
8 Knockout 1/day, AC Bonus +1
9 Brawler's Strike(Magic), Close Weapon Mastery
10 Martial Flexibility(Swift Action)
11 Maneuver Training +2 (??????)
12
13
14 Martial Flexibility(Free Action), Knockout 2/day
15 Maneuver Training 3 (??????)


Playing this build:
This one is as straightforward as build gets.  See Enemy, run enemy over.  It is rare that taking full attacks would be better than making an overrun.  Levels 2-5 Spiked Destroyer lets you get an attack when you overrun someone.  Level 6 you get your second attack and flurry, but at level 7 you get to make 2 AoOs against someone you overrun, so it comes out as a wash.  You'll be using your armor spikes as your primary weapon from levels 1-4.  Level 5 switch to unarmed strikes and leave the armor spikes for using spiked destroyer.

Magic Items:
Full Plate and a Heavy Steel Shield.  The specific enchants are up to you but  boosting your armor class is essential since you will always be in the middle of combat.
Amulet of Mighty Fists.  GO FOR THE ENHANCEMENT BONUS.  the enhancement bonus to unarmed adds to CMB for overrun
Gauntlets of the Skilled Maneuver - +2 untyped bonus to one combat maneuver.  yes please
Belt of _____ - prioritize boosting STR first (gotta get that overrun number up), the DEX (more attacks of opportunity, then CON
Dusty Rose Ioun Stone + Wayfinder - +1 insight bonus to AC, +2 insight bonus to CMB and CMD
Juggernauts Pauldrons - Free Enlarge person so you can overrun size huge creatures.  (Not worth the cost if you can consistently have an ally cast enlarge person on you)'