Okay, so if potential NK targets are (serp, torb, rob, kae) I think the best distribution is:
Calculated with relative values NK: 1, Serp: 0.6, Torb: 0.4, Rob: 0.2, Kae: 0.1
| serp | torb | rob | kae |
Akai | 35% | 25% | 20% | 20% |
Gawr | 30% | 30% | 20% | 20% |
Yuzuki | 25% | 25% | 25% | 25% |
I could share the code that came up with this conclusion, but I'd rather not if nobody wants to actually play with it as the search involved doing a counter search for how mafia should best randomly roll their NK target. Of course, if they just want a sure kill they can target sky or mw