Quick and Easy Questions (please read the OP)

[Trixie]

While we don't want to put too many limits on your creativity, NPCs are not there to give your character a game advantage. For example, you cannot create an NPC with a base and then use that base for yourself, circumventing the need to buy one. You cannot create artefacts to give to your NPCs. You cannot make them members of a Faction without approval or otherwise use them as a way to gain cheap influence or fame. If you have NPCs act as a 'deus ex machina' for your character in competitive situations, staff will step in to stop it. Etcetera.

Let's say a PC tries to invade my Base. If I'm not there but my Prime NPC Jarvis is there, can Jarvis officially fight the PC? And if so, would I write as Jarvis in that fight?

Now, what if I am also there? It hardly seems fair for invaders to fight both me and Jarvis, so I assume Jarvis isn't allowed to participate in that fight?

This is where Base fortifications come in. Jarvis would have to be an assist at that point in a PvP fight, BUT

Fortifications
A base can sometimes be a rough thing to defend. This becomes a bigger issue if your Base grows into a town or a sprawling city. Whether it comes in the form of a trained security force, defensive towers, or maybe just big walls, Fortifications exist to make your base more defensible.
Tier One Base Fortifications - 1000 OM Rudimentary fortifications don't provide much protection but are better than just locked doors. Maybe some doormen, a town garrison or traps. (Equivalent to 10% increase in defender's stats in strictly game terms). 
Tier Two Base Fortifications - 3000 OM (2000 OM if replacing Tier One) A bit better, this might include turrets, more complex traps or better trained soldiers. (Equivalent to 20% increase in defender's stats in strictly game terms). 
Tier Three Base Fortifications - 6000 OM (3000 OM if replacing Tier Two) This won't stop determined Primes, but this can certainly make the difference between victory and loss in a tight base defense. Get the best money can buy! (Equivalent to 30% increase in defender's stats in strictly game terms).