The Cho'Gall request

I want to make a double-character soon. It was mentioned on fabletop many times that a character with two heads/minds would be cool and someone even attempted it, but the lack of interest was a problem.

Now i'm looking for a good character concept and a pal to actually make a two-minded creature!

There are many ways to do this:
-A ghost incarnation thingy with a positive and negative conciousness
-A two-headed creature (Cho'gall is this) who's heads are always arguing for random reasons
-A pair of spirits depending yet limiting eachother, connected by lets say... something like an arcane chain? The chain can either be something that the spirits want to get rid of, or something that serves them well

The second biggest problem (the first being the lack of players with interest) is finding a game actually accepting such an extreme character.

I would be interested in being a double character, but frankly id want to be the evil/selfish half.

I worked a bit and got two concepts up:

A single spirit in the form of two sub-spirits, with an always arguing personality.

If one reaches something, enviousness comes to the other. If one gains something, bragging is expected. The best term to explain them is "two angry cats in a box".

They have powerful magical abilities atleast, since they lack in physique.

(the following idea is extremely hard to execute since life will have to be shared, and min/maxing will be done.)
A powerful ogre with two heads. One head is a strong mage with much brainpower, while the other is dominant over the body. It will be a forever ranging battle between the heads to decide who's the leader: the advisor to be the king, or the pilot to be the captain.

The mage one only controls his respective hand, and of course the head itself, while the other controls the legs, his respective hand, and of course his own head.