| MathNerd |
Anthropomorphic Animal (or Alter Self) + Familiar Melding + Mistmail barding gives your witch's familiar a permanent 20% concealment.
Note: I did the calculations to break down the cost of Mistmail, it is, in fact, priced as 24/7.
It's 7th level, if anyone can think of a way to pull this off at a lower level, let me know.
Or Alter Self (The lowest level spell that does the job)
School Familiar archetype, Familiar Adept Wizard gets 'Greater Summoned Shell' if you are a Conjurer, and it can control a Lantern Archon, Bralani Azata, Kyton, Salamander, or succubus.
A medium metamagic rod of extend spell (double duration) plus the occultist Arcanist archetype (1 minute per level) gives your familiar the ability to control a succubus for 2 minutes per level.
Improving communication:
Extra Item Slot: Belt of Dwarvenkind.
The wearer can understand, speak, and read Dwarven. \
Robe of Blending
Turn into an orc, or whatever, speak orc, or whatever.
Alter Self.
School Familar: Illusion, lesser illusory maestro (4th level, one level below speak with master your familiar can make illusions).
http://www.d20pfsrd.com/magic/all-spells/s/share-memory
Share memory pathfinder, 3rd level. (2nd level spells) Have your familiar imagine saying it in common, alter self is more effective.
http://www.d20pfsrd.com/magic/all-spells/a/accept-affliction
Same level/cost as remove curse, no opposed roll.
http://www.d20pfsrd.com/magic/all-spells/m/memorize-page
Memorize Page is automatically erased at the end of scenario, per the pfs rules, you can scribe whatever spells you memorize. Also useful for maps! Ironically, the PFS nerf makes this MORE useful.
http://www.d20pfsrd.com/magic/all-spells/d/duplicate-familiar
Duplicate Familiar: Range: Touch.
You can have the familiar carry the touch spell and use it when it needs it.
Alter self: Possibly also the same, if you can designate your familiar as the toucher for a spell that was personal converted to touch.