Diablo II/Act II

Atma
Atma is the owner of the public house, who recently lost her husband and son to the monster Radament. She can heal you, and initiates the quest "Radament's Lair".

Deckard Cain
Deckard Cain came with you from the Rogue Encampment to provide you information and to identify your magic items. He initiates the quest "The Horadric Staff" after you give him the Horadric Scroll.

Drognan
Drognan sells caster weapons, potions, and scrolls. He initiates the quest "The Arcane Sanctuary".

Elzix
Elzix is a retired thief who sells you low-level weapons and armor and lets you gamble on his unidentified magic items.

Fara
Fara can heal you and sell you weapons, armor and arrows. She can also repair your damaged equipment.

Geglash
Geglash is the town drunk, who gives you information about the problems facing Lut Gholein.

Greiz
Greiz is the captain in charge of guarding Lut Gholein. He lets you hire/resurrect mercenaries for a small fee.

Jheryn
Jheryn is the leader of Lut Gholein, who has become overwhelmed by the demonic threats facing the city. He initiates the quest "The Seven Tombs".

Lysander
Lysander sells potions.

Meshif
Once you complete Act II, Meshif can bring you to Kurast to begin Act III.

Warriv
Warriv can take you back to the Rogue Encampment should you wish to return.

Areas

 * Dry Hills
 * Arcane Sanctuary
 * Canyon of the Magi