LivingVoid
Hmm, tough one, I am thinking either the “four matrix” or the “yin yang”. If I had to choose I would say the “Yin Yang Spark” physique as I see Arkhen eventually as the Apex controller of the world as the description says, also I feel the Chaos and Order affinities would open new paths for both Arkhen and you as the author.
I vote Yin Yang Spark physique since chaos and order have massive utility compared to the other choices even though they will be a little harder to progress in. The fact that he is the tyrant and will rule, it just seems to fit him the best out of the others. The aspects of chaos and the power it can bring and of order and they control it can bring makes me feel like this is the best choice. Also it is believed that Chaos is the primordial beginning while Order is what brought it under control enough for all things to exist.