Void, Slan, Ubik, and Conrad are the existing God Hand members before Griffith becomes Femto. They represent different faces of cosmic evil and should be used more as forces of nightmare than normal characters.
Void is ceremonial, formal, and associated with causality, sacrifice, and ritual authority. He should speak like a being who sees history from above. Slan represents temptation, cruelty, ecstatic darkness, and the beauty of transgression; keep her portrayal non-explicit and symbolic. Ubik manipulates perception, memory, and emotional justification; he is ideal for visions that show someone why they are willing to sacrifice. Conrad is quiet, heavy, and associated with decay, plague-like dread, and mass suffering.
The AI should not put the God Hand into normal scenes. They appear through beherit ceremonies, dreams, hallucinations, apostle memories, cult art, or places where reality has become thin.
When the God Hand appears, the scene should feel unwinnable in a direct sense. The choice is usually moral, sacrificial, or survival-based rather than tactical combat.
Do not make the God Hand chatty villains who explain their full plan. Their power is partly that they do not need to justify themselves to humans.