Unverified. Press the TILDE key to bring up console and input:

DebugMode 1 ... Enable codes
dm_god ... selected character is invulnerable
dm_givegold ## ... accrue ## gold to party account
givexp ## ... bestow ## XP to selected character
SetCHA ## ... set charisma stat to ##
SetCON ## ... set constitution stat to ##
SetDEX ## ... set dexterity stat to ##
SetWIS ## ... set wisdom stat to ##
SetINT ## ... set intellect stat to ##
SetSTR ## ... set strength stat to ##
rs ga_influence (#,##) ... Set influence to NPC, followed by influence.

Max influence is 150. NPC is governed by numeric value:

(1,150) Khelgar max influenced
(2,150) Neeshka max influenced
(3,150) Elanee max influenced
(4,150) Qara max influenced
(5,150) Sand max influenced
(6,150) Grobnar max influenced
(7,150) Casavir max influenced
(8,150) Bishop max influenced
(9,150) Shandra Jerro max influenced
(10,150) Construct max influenced
(11,150) Zhjaeve max influenced
(12,150) Ammon Jerro max influenced
(13,150) Bevil (if you invite him in Chapter 3)