All sådan information lämnades i Diablo's manual, både vem som var och vad deras motivation kan vara.
Krigaren:
The Warriors of the lands of Khanduras are well trained in all of the
weapons of war. Ranging from crusading paladins to unscrupulous
mercenaries, Warriors can be found wherever there is conflict amongst
their countrymen. Many of these adventuresome men joined with King
Leoric's army and went to battle against the Northern kingdom of
Westmarch. As the fires of war burned themselves out, these Warriors
returned home to find their kingdom in shattered disarray.
Dark rumors of the mysterious demise of King Leoric abound and the
evil that lurks within his Cathedral has drawn many Warriors to
Khanduras seeking fortune and glory. ... Whether they are driven by
valor, honor, madness or greed, new Warriors arrive in Tristram every
day, ready to challenge the dark unknown that awaits them beneath the
earth.
Rogue:
The Sisters of the Sightless Eye are a loosely organized guild
shrouded in mystery amongst the peoples of the West. These highly
skilled archers employ ancient Eastern philosophies that develop an
"inner-sight" that they use both in combat and to circumvent dangerous
traps that they may encounter. Known only as wandering Rogues in the
West, the Sisters conceal their secret affiliation by posing as simple
travelers. Many pompous fools have made the mistake of underestimating
these steel nerved women in combat and paid a terrible price for their
vanity.
The strange events transpiring in Khanduras have caught the attention
of many of these Rogues. They have come from as far as the Eastern
dunes to test their skills against the dark evil that is said to be
lurking in Tristram. It is also believed that untold riches wait to be
discovered among the ruins of the Horadrim monastery.
Trollkarlen:
Although practitioners of the mystic arts are scarce within the often
superstitious and religious lands of the West, many magi have made the
pilgrimage from the Far East to see for themselves what horrors lie
beneath the ruined Cathedral of Khanduras. The veiled Brotherhood of
the Vizjerei, one of the eldest and most dominant mage-clans of the
East, has sent many of its acolytes to observe the dark events
unfolding in Khanduras first hand.
The Vizjerei, known for their brightly colored turinash -or
spirit-robes have taken a keen interest in both gathering knowledge of
demons and seeing them slain. The Vizjerei elders hope that their
acolytes will learn the secrets of the dark evil that they sense
growing in the West and can destroy it. The possibility of discovering
long-lost tomes of magical knowledge within the confines of the
labyrinth has also captured the interest of many wandering Sorcerers.
Utöver det var det lite vagt, så du kunde projekta dina egna motivationer på karaktären. Det var den väldigt lilla "RP" -delen av Diablo som en RPG.