Each section is filled with a wealth of information, including how to obtain or see these characters in action, their gambits and any other relevant information I could dig up.

 Guest Characters

From time to time playing through the story you will have Guests join your party temporairly, they add themselves to your party without your concent and act on their own accord dependant on their set gambits.
Characters: Larsa, Vossler, Reddas, Amalia and Basch.

Support Characters

At different times during your adventure you will be joined by a number of support characters, they don't join your party, but they will aid and fight alongside your party. Most of them are from Clan Centrino sent to help you with a mark, whilst others are just random spawns. They also run on a gambit system, so if they can be handy if you need a bit of help.
Characters: Basch,  Dalmascan Soldiers, Larsa, Gabranth, Bansat, Monid, Kjrn, Viera Wayfarer, Insecure Seeq, War-chief Supinelu, Rabanastre Watch, Bangaa Hunter, Garif Hunter, Garif Warrior and the Seeq Fisher.

The Judges

The Judges reign supreme in the Archadian pecking order, taking orders directly from the Emperor himself. They are a special order of knights in the Archadian army, essentially commanders, they weild the law however they see fit.
Characters: Gabranth, Ghis, Bergan, Drace, Zargabaath and Zect

Archadians

The Archadians are an oppressive force trying to control Ivalice with their iron fist, early in the game Emperor Gramis is killed leaving the power thirsty Vayne in control of the entire Archadian force.
Characters: Emperor Gramis, Vayne, Larsa, Cid, The Senate.

The Resistance

The Resistance are those who oppose the Empire, composed of Dalmascans, Bhujerbans and anyone else who will stand to fight, the resistance is a scrappy bunch of fighters determined to protect what they believe in.
Characters: Rassler, Reks, Vossler, Ondore, and Al-Cid.

The Others

This section is filled with a number of different characters from varying aspects from the game, or do not have enough character to befit their own section.
Characters: Montblanc, The Head Hunters, Venat, Anastasis.

 Races

A look at each of the races, imagery, temperments, personalities and all those other bits and pieces.
Races: Hume, Bangaa, Viera, Moogle, Seeq, Garif, Nu Mou, Uratan Yensa and the Occuria.