NOTE: Gestalt build, and based mostly on Brawl.
Here's what I've got so far:
(Sources: PHB2, SRD, BoED, BoVD, MoI, RotD, SS)
NG Masochist Dragonborn (mind) water orc
Traits: Slow
1 | Barbarian 1/Totemist 1 | Berserker strength (variant), Feat: Sacred Vow |
2 | Barbarian 2/Totemist 2 | - |
3 | Crusader 1/Totemist 3 | Feat: Vow of Poverty |
4 | Crusader 2/Monk 1 | Decisive Strike (variant), Soulwarp Strike (variant), VoP feat: Righteous Wrath |
5 | Crusader 3/Monk 2 | Bonus Feat: Fiery Fist |
6 | Crusader 4/Monk 3 | Feat: Cobalt Rage, VoP feat: Sanctify Natural Attack |
7 | Crusader 5/Monk 4 | - |
8 | Crusader 6/Monk 5 | VoP feat: Touch of Golden Ice |
9 | Crusader 7/Monk 6 | Bonus feat: Ki Blast, Feat: Improved Toughness |
10 | Crusader 8/Fighter 1 | Bonus Feat: Combat Reflexes, VoP feat: Vow of Abstinence |
11 | Crusader 9/Fighter 2 | Bonus feat: Azure Toughness |
12 | Crusader 10/Totem rager 1 | Feat: Pain Mastery, VoP feat: Fist of the Heavens |
13 | Crusader 11/Totem rager 2 | - |
14 | Crusader 12/Totem rager 3 | VoP feat: Nimbus of Light |
15 | Crusader 13/Totem rager 4 | Feat: Robilar's Gambit |
He will have the Rageclaws soulmeld shaped, along with something to boost agility and jumping.
Due to Robilar's Gambit, Lucario gets in more attacks while taking more damage. However, as Lucario takes damage, he gets bonuses due to Masochism and his Crusader abilities. For every 50 points of damage he takes, he gains +2 Strength from Pain Mastery. When his hp is below 10, his Berserker Strength kicks in (which also gives him 2 more essentia), and when his hp is below 0, his rageclaws activate. While he has the Slow trait, he also has monk speed and barbarian fast movement, resulting in a net speed of 45ft.
If Lucario's type raises some eyebrows, he can use a ritual from Savage Species to become a Magical Beast (and add the cold subtype to represent his Steel-type traits).