Spoiler: KnosaraYou have an implication in your post that's problematic within PF rules. Roll kn(arcana) for details.
Edit: Actually, you'd make it on a 1.
You actually don't get as much info as you might expect. In Pathfinder, Mind Blank explicitly stops see invisibility. By extension, divination counters work on things that add extra options to sight - Arcane Sight, Aura Sight, Greensight, whatever - and some of the folks here actually have those. Anyone warded by such can't be seen if that's the only way you'd be able to see them (unless it's a non-divination version, such as that natural greensight and see in darkness of yours). But a Wizard with Invisibility, No Scent, and Mind Blank up? They could be standing right in front of you, and if their Stealth (with the invisibility bonus) beat your perception, you wouldn't know they were there. Only a couple of folks have that on their sheets, though, so you can tell who they are easily enough by them NOT having obvious magical auras fit to light up the countryside.
Spoiler: On bonded companionsYou have them. You get to RP them. They remember the events of the game as though they were real events. However, if pressed to examine their memories, they will notice inconsistencies, such as doing the exact same quest several times. This may lead to problems, at your discretion. Try to keep their capabilitiesin mind when rping them.