Are psy powers definitely random?
The way it's described is as follows. Lets say you have a Psyker, your psyker comes with ubersucky power 1, ubersucky power 2, fucking OP POWER 3.
You can take ubersucky 1 and 2, flush them down the toilet and select 2 schools of powers based on what your army can chose, both can be the same school.
You then "generate" your new powers, what this means is never described or explained but most likely same as fantasy. You Roll a D6, there will be a base power in every school you can always select, there are 7 powers in every school so you basically roll for power 2-7 on a D6. If you chose the same school twice you get to roll 2D6, if you roll doubles you get the power the number is and can select any other power in that school of magic.
This is how fantasy works and I bet it will be the exact same for 40K.
MCC, you could model each inquisitor as Bruce Willis and call the Twelve Monkeys list.
Yeah, and this will be my armys Iconography and banner graphics