[Targan]

Well Harnmaster/Gunmaster doesn't use Charisma but it does have the Aura stat which fulfils part of what Charisma requires. Aura represents the strength of a person's soul, and people with higher Aura are naturally more empathic and can seem to have quite warm personalities.

There were several PCs in my campaign who had unusually low Aura stats and they came across as very cold, souless sorts of hard core killers. In particular my brother's character, USMC Sgt Urana Ratowi, a giant, ugly Samoan scout/sniper. He had to work at being friendly with other people because both his Aura and Attractiveness stats were below six and people tended to recoil from him. It didn't help either that he was 6'5" and really buff. Ratowi's Aura was so low that he actually got 1 or 2% natural magic resistance. Didn't do him much good in the naturally low-magic T2K earth environment obviously.