Fun with Aberrant Tumors!

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).

How about being an orc?
Amplified Rage (Teamwork)

Prerequisites: Half-orc or orc, rage class feature.

Benefit: Whenever you are raging and adjacent to a raging ally who also has this feat or flanking the same opponent as a raging ally with this feat, your morale bonuses to Strength and Constitution increase by +4. This feat does not stack with itself (you only gain this bonus from one qualifying ally, regardless of how many are adjacent to you).

Keep in mind that Amplified Rage requires that the ally be raging as well. Normally, familiars don't have a way to rage. This is why there are a few threads on here that revolve around taking 1 level of Bloodrager, the Aberrant Tumor feat, and levels in Skald so you can allow your tumor to rage whenever you do Raging Song, so it gives both of you the benefits from Amplified Rage.

Also keep in mind that the idea suggested in the original post of taking the valet archetype for an Improved Familiar isn't generally considered legal. There isn't a clear FAQ or ruling on it, as far as I know, but there are posts from Paizo employees somewhere on here that state that it's not intended for Improved Familiars to take archetypes.

bloodrager/barb 1 eldrich fighter 2 can pick up sympathetic rage which is a combat feat and amplified rage shared with valet familiar gets it working.

Barb 2 with the raging mount rage power and using your familiar as a mount lets it rage.

Such strange thread necromancy. At any rate, the current tumor exploit is giving it the Protector archetype so it functions as a recharging hit point battery.