A new feat in the ACG gives a character with the aberrant bloodline the ability to gain a tumor familiar, as the alchemist discovery. Bloodragers can get said bloodline, and it even ends up being one of the best in my opinion. So start with a bloodrager with the Aberrant Tumor feat for a tumor familiar. Familiars get the BAB of their master (so full BAB), and half their hit points. Bloodrage explicitly does not give temporary hit points, so expect your tumor's health to fluctuate up and down as your character bloodrages.
Get an Improved Familiar (level 11 without Magical Knack, level 9 with), preferably with the highest strength possible while remaining tiny sized. With a cursory glance, the Nycar has the highest, with a Cacodaemon and Cythnigot coming in at a close second. A tiny familiar when polymorphed to something small or larger gets an automatic +4 to strength and –2 to dexterity before the polymorph affect is added, so that Nycar has an effective strength of 17 before any buffs. Not bad for two feats and a spell! You can even start as a human for the Eye for Talent alternate race trait to give him another +2 to his strength.
Implementing this to fight as a team: Make your familiar a valet archetype from the Animal Archive so that he shares your teamwork feats. From that point you're able to take the Improved Spell Sharing teamwork feat, along with maybe Outflank. I'm sure you can see where I'm going with this.
Buff yourself and familiar with beast shape I, bull's strength if you've got time, and enjoy your full BAB flank buddy!
Any thoughts on how to make this better? I'm seeing a medium cat familiar with 21 strength (25 with bull's strength) available at level 10. So a class feature that can bite/claw/claw at +17/+17/+17 for (1d6+7).