My brother wants to play a character with multiple personalities but we're unsure how to actually go about switching which personality is in control.
The system he currently has is this:
Every 1d6 hours, do a Wisdom check for the inactive personality, and a Wisdom save for active personality. If active personality fails save, inactive personality becomes the active personality.
I'm under the impression that there is probably a different save/check that would be better for this, but I can't think of what it might be.
The DM already knows about this character concept and has given the OK to do it.