Fighter: Primary Combat
Cleric: Healing, Support Magic, Undead-dealing, Secondary Combat
Wizard: Magic Artillery, Support Magic
Rogue: Reconaissance, Opportunistic Combat, Trap-dealing
9 roles.
Primary Combat: High BAB, High AC, High hp, High damage output
Secondary Combat: Helps Primary Combat
Opportunistic Combat: Archery or mobility oriented, but low staying power
Magic Artillery: Big BOOM spells
Support Magic: Buffs, counterspells, divination, transport
Reconaissance: Sneaks around and/or asks questions, wilderness survival, avoids party being surprised
Healing: Cure wounds, removes poison, dispels adverse effects
Trap-dealing: Finds and disarms traps, mundane and magical
Undead-dealing: Turns undead and/or protects party from undead abilities
Artificer: Support Magic, Magic Artillery, Trap-dealing
Barbarian: Primary/Secondary Combat, Reconaissance
Bard: Support Magic, Opportunistic Combat, Reconaissance
Druid: Support Magic, Healing, Reconaissance, Secondary Combat
Monk: Reconaissance, Opportunistic Combat
Paladin: Primary Combat, Undead-dealing, Healing
Ranger: Secondary Combat, Reconaissance, Healing
Sorcerer: Magic Artillery
Soulknife: Secondary Combat, Reconaissance