You meet almost an entirely new cast of companions this time around, starting with Safiya. You'll be able to have 3 companions in your party, in addition to your PC. All companions will be available early (first third) of the game. With very few exceptions, you'll never be forced to have a certain (or any) companion with you.
At least two of the companions will be mutually exclusive: Okku and One of Many. For reasons you will discover they simply will not be able to co-exist. This is the one exception where you ARE forced to make a choice as to which one will be available. Once the choice is made, there is no option to recruit the other.
As for your previous companions, well - according to George Zeits,"You'll have a very good chance of seeing (and potentially travelling with, for a short while) one of your companions from the first game. And you'll definitely run into another. You'll hear about most of the others from various sources throughout the game." "Tarmas is still alive, and some players may see him (very briefly) in MotB"
Race: female Human Class: Specialized wizard (Transmutation) (7) / Red Wizard of Thay (10). Alignment: Neutral (50/50) At Start: HP 102 AC 21 Starting Ability Scores: Str 9 Dex 15 Con 14 Int 19 Wis 11 Cha 14 Starting Skill Scores: Concentration (31), Craft Alchemy (24), Craft Armor (7), Craft Weapon (19), Heal (11), Lore (25), Spellcraft (25) Starting Feats: Quick to Master, Skilled, Arcane Defense (Transmutation), Spell Focus (Transmutation), Great Spell Focus (Transmutation), Spell Penetration, Greater Spell Penetration, Empower Spell, Extend Spell, Persistent Spell, Scribe Scroll, Craft Magic Arms and Armor, Craft Wondrous Items, Summon Familiar, All Red Wizard Feats Special Abilities: Immunity - Mind Spells
Other: Carries the Enchanter's Satchel and Shaper's Alembic. Safiya is the first NPC that your character encounters. Romance option for male PCs.
Kaelyn the Dove
Race: Female half-celestial Alignment: Neutral Good Class: Cleric of Ilmater At Start: HP 221 AC 26 Starting Ability Scores: Str 14 Dex 16 Con 20 Int 12 Wis 28 Cha 24 Starting Skill Scores: Concentration (25), Lore (21), Spellcraft (21) Starting Feats: Combat Casting, Divine Might, Extra Turning, Power Attack, Racial Abilities: Spell Resistance 27, Damage Reduction 5/magic, Darkvision, Immunity to Disease, Racial Natural Armor Bonus, Racial Spells (Mass Charm Monster, Resurrection, Summon Planetar, Word of Faith) Resist acid energy, Resist cold energy, Resist electrical energy, Resist poison Domains: Good, Strength, Class Abilities: Aura of Courage, Smite Evil, Spontaneous conversion, Turn Undead Background: Strong Soul
Other: She once worshipped Kelemvor, the current god of the dead but, for reasons you may uncover, she fell out of favor with her god in a rather dramatic fashion. As far as the companions being more fully developed goes, Kaelyn, who is completely optional, has more than twice as many lines of dialogue as the most developed companion from NWN2.
Gannayev-of-Dreams, aka Gann
Race: Male Hagspawn (but looks like a blue-skinned Human) Alignment: Chaotic neutral. Class: Spirit Shaman (17) At start: HP 187 AC 28 Starting Ability Scores: Str 10 Dex 18 Con 17 Int 10 Wis 23 Cha 14 Starting Skill Scores: Concentration (23), Spellcraft (20), Spot (28), Survival (26) Starting Feats: Luck of Heroes, Alertness, Dodge, Improved Critical (Short Bow), Weapon Focus (Short Bow), Point Blank Shot, Zen Archery Special Abilities: Darkvision, Hagspawn Natural Armor, Spell Resistance (28)
Other: Romance option for female PCs.
One of Many
Race: Undead Wraith Class: Rogue (20) - variable? Alignment: Neutral evil At start: HP 240 AC 37 Starting Ability Scores: Str 20 Dex 21 Con 23 Int 16 Wis 8 Con 16 Starting Skill Scores: Disable Device 26, Hide 30, Listen 24, Lore 26, Move Silently 30, Open Lock 28, Parry 28, Search 26, Sleight of Hand 28, Spot 24, Tumble 28, Starting Feats: Dodge, Mobility, Spring Attack, Improved Critical (creature), Weapon Focus (creature), Alertness, Stealthy, Crippling Strike, Uncanny Dodge, Improved Uncanny Dodge, Defensive Roll, Evasion, Improved Evasion, Opportunist, Sneak attack, Trap Sense (+6) and Trapfinding
Other: Described as being composed of hundreds of Evil human souls.
Race: Spirit Bear (Fey) Class: Fighter Alignment: Lawful Neutral At start: HP 380 AC 33 Starting Ability Scores: Str 37 Dex 12 Con 27 Int 9 Wis 12 Con 16 Starting Skill Scores: Parry 24 Starting Feats: Blind Fight, Cleave, Great Cleave, Weapon Focus (Creature), Weapon Specialization (Creature), Greater Weapon Focus (Creature), Greater Weapon Specialization (Creature), Power Critical (Creature), Improved Critical (Creature), Improved Power Attack, Power Attack, Knockdown, Toughness, Alertness, Resist FIre Energy
Kaji - Safiya's Familiar
Race: Construct (homonculus) Class: Construct / Rogue Alignment: Neutral (50/50) At start: HP 90 AC 19 Starting Ability Scores: Str 8 Dex 15 Con 10 Int 10 Wis 12 Cha 7 Starting Skill Scores: Disable Device 15, Hide 17, Listen 18, Move Silently 17, Open Lock 17, Search 15, Spot 18 Starting Feats: Weapon Proficiency: Creature, Alertness, Lightning Reflexes, Darkvision, Low-light Vision, Improved Evasion, Roque Familiar, Trapfinding
Other: Useful rogue skills
On addition to the main companions listed above, there are a number of other people who can be enticed to join you on your adventurers. For more details see the Supporting NPC page.