In my upcoming campaign, one of my players has created a charter who:

1. Is a Mind Cleansed Arbitrator
2. Has some vital knowledge that is extremely dangerous, but could be very useful. Thus, her Inquisitor (obviously a Radical) has had this PC's personality split into two parts, effectively breaking up this knowledge into both memories.
   
   Note: two of my players (a married couple) have to take turns playing each game session due to family reasons. Each person is playing one of the two personalities.
3. The traitorous personality is grim, vindictive, sadistic and extremely hateful of the Imperium. She can't remember exactly why, but the Mind Cleansing couldn't remove those feelings. She wants to "bring down the Imperium and join some form of resistance".
   
   Note: the other personality (played by the other member of this couple) is quite the opposite: rational, thoughtful and calm. Good cop bad cop scenario. I am unaware if this other personality shares rebellious tendencies.
4. We've already agreed together, that he will eventually take the Infil-traitor "class" from the Radical's handbook.
5. None of the other players, including the other half of his personality, will be aware of this plot, obviously.

Now, my idea is this:

The Inquisitor is using this character as very risky form of bait.

The PC is deliberately on the lookout for a Recidivist or other Rebellious group out there, in order to join their cause. Perhaps this is what the Inquisitor is hoping will happen?

On the other hand, perhaps this Radical Inquisitor is on the lookout for nefarious organizations with whom to ally with or learn from, there's another possibility.

Would any of you have any suggestion on this theme?

TOO LONG, DIDN'T READ: One of my players' PC is a mind cleansed "traitor". How can I work with this?

Does the "Loyal" site knows what the "Disloyal" did?

And more important: how do you and the couple-players plan this to end? Will this go on for all eternity or is everyone fine that either the group will wipe out the char or the char will wipe out the group someday-somehow?

Gregorius21778 said:

Honestly, I'm worried that the whole thing will be a huge cluster ****, so I'm trying to figure out a way to make it work.

Ideally, the Inquisitor is cool with this disloyal side, because he's hoping that it puts him into contact with a heretical organization.

Since the Mind Cleansed background enforces a kind of insurance policy for the inquisitor (a secret code word that controls the PC to an extent), I'm thinking of bringing the assassin of the group into the "know"... to a degree.

Perhaps the Assassin has orders from up on high that he is to keep a strict eye out on this arbitrator, and to take appropriate action if things get out of hand- with the secret code word, perhaps?

Well, reading your OP I got the same worries.

Suggestion:
Could your players accept that "those other site" is "mean as hell" but not actively disloyal? He can HATE the Imperium as much as he/she wants, but will not actively try to "bring it down" (after all, that is what a MINDWIPE is ought to do...).

Of course, this would lead the "Infil-Traitor" ad absurbum...but the way you wanted to us it is not the way it is used either. As far as I read it, an Infil-Tratior pc would have been a pc "brought in" by a RIVAL radical inquisitor, thereby endangering the group with the programm that will start to run.

No, you're right.

I will have to work something out. Something else.

Thanks for you advice.

>>The PC is deliberately on the lookout for a Recidivist or other Rebellious group out there, in order to join their cause. Perhaps this is what the Inquisitor is hoping will happen?<<

Yes. The Inquisitor is using the dark personality as a mole who believes so deeply in its cause that it will convince any Rebellious cults or whatnot to accept it as one of their own. He will then use this as leverage to destroy the cults and acquire anything they left behind. The Inquisitor doesn't want to actually join a rebellion after all - he may be a Radical, but he is still a servant of the Empire - so he eats two birds with one fork, destroying the cult and sacking their hideout for outlawed information.

>>Perhaps the Assassin has orders from up on high that he is to keep a strict eye out on this arbitrator, and to take appropriate action if things get out of hand- with the secret code word, perhaps?<<

I'd say no. Don't let anyone else in on it, so when it comes out the entire party is flabbergasted. If the PC does something inappropriate in the presence of the other acolytes they should take care of it anyway - they don't need to be assassins with special dispensation. The servants of the Empire are zealots, after all, who should not suffer a heretic to live. (at least not suffer him to outlive his usefulness)

Have the dark personality drag them in over their heads ... they are ordered to infiltrate a rebellious cult but she joins it whole heartedly, which results in her discovering things they would not otherwise have known ... but the party has to either support her madd heresy in order to uncover the deeper truths, or fight against it and be discovered for what they are.

Necrozius said:

Well, it is not completely "unworkable". With the named changes, the whole "2 player / 1 pc" could still work. Simply base it on the "Mindwipe" instead of the "Infil-Traitor".

Other method would be that the real Arbitrator IS this calm and loyal person...while the other one is the "Infil-Traitor". This one could come from an Istevaan-Faction Inquisitor whom smuggled a number of those "loose canons" in to "improve" the Inquisition. The only problem with that case is that sooner or later this secound persona will trigger "completely" and after it is "overcome", the second player needs a new way to attend.

If you like "radicals", how about one of the Demon Options given in the RH? The second player will then not modell the demon (which is "submerged" for now and is represented by you, the GM) but the "darker half" of the soul of said Arbitrator. Only thing with this Daemon seeds is that they are going to destroy the pc in the futur since corruption is inversible.

If you Inquisitor is "Radical Xenos" (and you own the DotdG) how about a Cryptos Posession ? The Inquisitor of your cell knows about the Cryptos and keeps it so he can study the thing and make use of his knowledge. While the Cryptos is not really interested in working with the =I= (not even fully understanding this concept that some people of a race working against the other parts of the same race...) he believes that for know it is the best to do since this "Inquisitor" offers the one thing a Cryptos wants: protection!
Funny thing: In this scenario it is most likely that the brutal, sadistic Arbitrator is the REAL persona while the calm, friendly and cooperative half is the CRYPTOS who supports the cell the best way he sees fitting since they are his "protection".

Hope some of the ideas are helpfull.

Why not take split personality to the extreme ?

The two players get to play a pair of identical twins, one good and one evil. They dress, act and speak in the same way so the rest of the party need not know they are dealing with two different characters.

Why are the twins never together ?

Well... they were born as siamese twins sharing one heart. When they were seperated, the doctors put their shared heart in a removable cartridge located in a cavity in their chests. They now take turns using the heart while the other one is in stasis/suspended animation.

How to tell them apart ?

The heart cavity is in the left side of the body on one of them, the right side on the other twin.

That way, one character is free to betray the party any way he/she likes without anyone else knowing about it, but to therest of the group it is done by the same PC.