So I was just having fun building characters for pathfinder when I thought of something. Can a person use gargantuan of colossal weapons? With the penalty of course.
Is there a certain limit of size category differences that you can go.
And don't worry about stats, but I'm guessing you'll need quite a large strength. Would it be better if the character was large?
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A Titan Mauler and Titan Fighter let you use an oversized Two Handed weapon (with two hands), though that is still just one size category higher than the character.
The size categories of the weapons are compared to the character's size to alter the measure of effort (Light, One Handed, or Two Handed) needed to wield the weapon. If it goes beyond one of the designations of the measure of effort, the character can not wield it. (One step over Two Handed or one step under Light) Barring any ability that changes this (such as the two Archtypes I mention above), a medium character is unable to wield a weapon beyond the Two Handed designation alteration.
The rules start on page 141 of the CRB. (Light, One-Handed, Two-Handed) The Inappropriately Sized Weapons section is in the Weapon Size section, on page 144 after the Weapons table on pages 142 - 143.
So a Huge light weapon can be wielded by a Medium creature Two-Handed. (two steps up) The Gargantuan light weapon would be unwieldable by a Medium character.
As a general rule of thumb, Pathfinder is incredibly hostile to oversized weapons builds. It's really hard to pull off and the penalties are rarely worth it.
I've made homebrew suggestions, before, on how to pull off a truly oversized weapon build before, but obviously those would not be official to any degree.
In the official rules, though, wielding anything that is actually bigger than you're supposed to wield is a near-no, and was only relatively recently changed from "you can't do it at all", to "you can go with something that is effectively one step bigger than it should be."
If you're in a home game, and want a set of guidelines that should make it possible to wield oversize weapons without going too far out of balance, I've linked to my earlier thread
There'd still be a practical limit, and definitely wouldn't work for organized play. However, in a home setting this might work well enough as a houserule if you're set on the trope of huge-weapon wielding characters.
A titan class can wield a large two-handed weapon. Then you can enlarge and lead blades to get a "gargantuan" sized weapon.