Mounted Berserker
Reqs: Ride 10 ranks, Mounted Combat, Ability to Rage.
Alignment: any chaotic
Saves & Bab: as Barbarian
Level Abilities
1 Raging Mount 1/day, Rage on Horseback
2
3 Bond with Mount
4 Intimidating Charge (+4)
5 Raging Mount 2/day
6 Mount as a Weapon
7 Ride Down
8 Intimidating Charge (+8)
9
10 Raging Mount 3/day (no longer winded)
The only thing scarier than a raging berserker is a raging berserker on a horse.
Raging Mount: The Mounted Berserker can inspire his rage in his mount. The mount can rage as a barbarian of first, second, or third level barbarian, depending on how many times a day it can rage (i.e. if it can rage 3/day, it rages as a third level Barbarian, plus its no longer winded.)
Rage on Horseback: The barbarian suffers no penalty to Riding related skills even while raging (i.e. Ride, Handle Animal, etc.)
Bond with Mount: The Mount and the Mounted Berserker can understand what the other wnats perfectly, and can communicate empathicly, though they cannot use spoken language or even words, only feelings or thoughts. They can, however, undertsnad what the other MEANS perfectly.
Intimidating Charge: If the the Mounted Berserker succeeds at a Ride Check DC 15, he forces any opponent to make a Will Save (DC 10 + Mounted Berserker levels + Amount by which the Ride Check exceeded the DC). The Berserker gains a special competence bonus listed on the chart for the Ride Check.
Mount as Weapon: The Mounted Berserker is skilled at using his mount as a weapon in combat. The Mount gains another attack, in addition to any it may already have, with an attack bonus equal to the Mounted Berserker's level
Ride Down: As a free action that provokes an AoO during a charge or while closing on an enemy as large as one size greater than the Mount, the Mounted Berserker may have his horse make a Bull Rush attack, using the Berserker's Attack Bonus in the check. If the Mount succeeds in the Bull Rush to knock the opponent to the ground, it may trample the opponent for automatic hoof damage
It may not be balanced, but I just made it up just now. If it sound like something you want, then I'll be happy to refine it, ok?