Have a way to fight (even a hacker with a light pistol has a lot of punch when firing Capsule Rounds with DMSO & Cyanide)
Have a way to investigate (drones, detection spells, contacts, etc, all count)
Have a way to make others better (buff spells, item acquisition, driving, knowsofts, sprites, etc)
A character with all three can almost always be doing something at a con table.