Level 10 Gargantuan Swordsman
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<- Gargantuan Weapons at ECL 10 ->
<- Expanded Psionics Handbook, Complete Warrior, World of Warcraft Roleplaying Game, Magic Items Compendium ->
 Game Rule Components
Not alot really
If not a Half-Giant, Strongarm Bracers. A Gargantuan Greatsword
Starting Ability Scores (Before Racial Adjustments): (I used the stats I rolled for a Paladin a while back) Str 18 Con 16 Dex 14 Int 14 Wis 15 Cha 15 <- starting ability scores before racial adjustments ->
Race (Templates): Half-Giant, Hellish Growth Fel-Sworn
Starting Racial Traits: +2 Strength, +2 Con, -2 Dex
Hellish Growth +6 Strength, +4 Con, -2 Dex, -2 Wisdom
Final Stat Line: 26 Strength, 22 Con, 10 Dex, 14 int, 13 wis, 15 Cha
Three Levels of the Wow rogue allows one to, via interpreting the rules regarding Bonus feats on page 218 in the Monster Manual, to take Wield oversized Weapon, Combining this with Powerful build, and a Size Increase thanks to Hellish Growth from the Fel-Sworn prestige class, and BAM Gargantuan Greatsword. If one is able to swindle there DM into either letting them take a few levels of Duskblade, or Psychic Warrior, you could, theoretically become Colossal. Combine this with a few feats (Powerful/Greater Powerful Charge, Weapon focus tree, Improved Bullrush, ETC) and you are the master of the battlefield.
 Munchkin-Size Me
Continuing with the Idea of one big weapon, you make it a Keen, Thorium Jovar, giving you a 15 - 20 Critical, allowing you a 25% chance of inflicting double the ridiculous amount of damage. I myself would make the Jovar styilistically a No-Dachi, and combining the Glowing Green eyes of Fel-Sworn, with Long Silver hair, and black leather clothing to strike fear into the hearts of DM's and FF PLayers everywhere.
Oh, and to alleviate the lack of a full base attack bonus, make a Shirt of Divine Might. Add in a few Levels of Warblade from the Tome of Battle, and a Ring(?) of the Diamond Mind, and use Time Stands Still for Four shots. Add speed to your weapon, and it becomes Five. Nigh Guaranteeing at least ONE critical.
 Side Notes
<- overview of additional info about this build ->
The DM Allowing everything I have just suggested. Other than that, nothing. Make sure you start as a Good character, so when you take the level of Fel-Sworn, you then shift to Neutral.
 DM Counters
Disallow any of the following: Strongarm Bracers, Half-Giants, Fel-Sword, Cheesy Rule interpretations.
This Idea came to me when I was holed up with my wisdoms having been removed.