I think you could add a constitution saving throw against suggestions from the other voice in your head to keep things engaging.

That's ... actually a pretty good pitch. I think I would also split the character in combat to avoid having one player be idle for several hours or even sessions in case a very long boss fight happens.

Even worse it's an hour of ingame time, which can be over in five seconds in the real world or almost an entire session depending on what you're doing. I would think flipping every session would be a better chance at making this work

Surely that would be a charisma save, possession is like the only use for charisma saves!

I ran a game for my kiddo and their friends and my kiddos character was similar, they had found a bunch of bottles that had different colored liquids in them. Character was an artificer/warlock who was a refrigerator repair man named Sam Sung. Self built mechanical armor that was a mini fridge and they stored the bottles inside. Each bottle was the essence of a divine or demonic being that became the “patrons” that were constantly fighting over the character. Basically the character ways had 12 different voices telling them what to do. Best part was kiddo was constantly drinking from the bottles.

I think if I was going to do this I'd come up with some basic mechanics for the one not in control to act as a ghost on the other one's shoulder. Let them use a limited selection of their abilities, see and hear what's going on, speak exclusively to the other player, and influence the in-control one's dice rolls a little


What if one player kept whispering in the other's ear?

Agreed, give a chance to flip at the beginning of every turn, since that’s when reactions and most abilities/spells reset. Also, to further reduce the chance of one player holding the character too long and to add a little fun tension: instead of a coin flip, in order to take over, the player not presenting makes an unmodified DC10 check that decreases by 1 with every failure and resets on a success.

Also makes sense that in higher stress situations like combat, they'd be fighting for control more frequently than when they're chilling in camp.

So would the character have to carry two sets of gear and change with each personality switch? Would the warlock even have the strength to haul around a paladin's armor and sword?

Is there a name for this trope of cramming really wacky, difficult, high spotlight, stuff into a game like DND that doesn't especially support it? I usually feel bad because I want to encourage creativity, but I also don't want this guy to have 80% of the table attention while Bob the Fighter and Joy the Rogue are playing by the numbers.

Limiting skills and abilities to only one class of a multiclass character at a time is going make them fall behind very quickly. As a DM that is my only concern, love everything else!

Reminds me of the twins from Kingmaker.

I encourage you to try [Everyone is John](https://rtwolf.github.io/Everyone-is-John/) then.

Might be fun to add a check to it. Maybe something akin to a concentration check that they have to roll when they take damage to hold on to their connection to their patron. Failure means they flip.

That sounds like a blast

Wouldn't that character get super nerfed fast? Even at an even split of class levels you'll be half the class level of the rest of the party, with only hp/proficiency keeping up.

Main Character Syndrome

Sometimes it's just about having fun.