Basically 1st class prime stats must be at least 15 and 2nd class prime stats 17. Only for humans. Certain classes like sorcerer cannot dual class. Only valid multi-class options can be dual class combinations. 2nd class cannot be a kit.
Be advised that druid considers both wisdom and charisma as prime stats for some reason.
And the Shadowdancer kit for Rogues consider Charisma to be a prime stat. No other Rogue kits have that requirement, just the Shadowdancer.
Not sure how it is in traditional D&D, but I vaguely recall in NWN2 manual that the Shadowdancers are supposed to be some kind of performers who do a specialized kind of "shadow play" for the public. That would make more sense for the charisma thing. At least this is how I would RP it.
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Basically 1st class prime stats must be at least 15 and 2nd class prime stats 17. Only for humans. Certain classes like sorcerer cannot dual class. Only valid multi-class options can be dual class combinations. 2nd class cannot be a kit.
Be advised that druid considers both wisdom and charisma as prime stats for some reason.