Kinda suprised.
Why do you think he's most useful?
Neablis says diviners are able to affect
rolls meaning we have a way of gaining a general bonus to some rolls which will be very useful especially on the more important ones.
Anyway, here's what I think we should do on a few things:
[] Diplomat-spy: Victan's active action bonus can be applied to all diplomacy rolls, including first contact with a new culture.
Very useful and will stack with our Woman of Stone bonus even though he can only help with one of those actions. He's been able to do great things while being a diplomat and best kind of spy is one who no one would think is because they don't want to believe it.
[] Infiltrator: Victan may go on active missions involving stealth & subterfuge to acquire data or objectives that would otherwise be completely unavailable. Unlocks powerful new narrative subterfuge options. Will be boosted by cybernetics research.
While this would put him in danger, we could get stuff that would otherwise be unobtainable like Astartes gear or STCs of which the Mechanicus are notoriously cagey about even just a damaged fragment. Heck, he might even be able to assassinate enemy leaders should it be necessary
[] Master of Whispers: Victan will passively cultivate contacts in any society you interact with, building up intelligence over time. Upon return visits this will quickly update you on the local happenings.
This option is tempting but this requires us to revisit place we've been to alot. We're an explorer, we'll often be travelling to new places. I can understand why some would take this as knowledge is invaluable, however, I personally would pass on this.
[] Virtuoso Spy : Victan's bonus to standard infiltration actions increases to 1.5xlevel.
This one I feel would give Victan less flexibility overall. He'll be a better spy, yes, but that's it. Number go up, yeah but it'd be a specialized number.
As for picking a psyker, I am unsure. Ker being a telekinetic who wants to explore would make for an interesting companion. Cia, a tomboy pyro with ambition would be awesome and cause all kinds of shenanigans. Kezathi the diviner I want to take on principle because the poor bean definitely needs help. As for the Psyker group, being able to study all branches of Psykic is tempting but we have too many things to research already.