I'm about to make my -7 character for PFS, I have enough GM credit to start at level 3. Im considering this:
Lvl 1 Human Rage Chemist (Favored Class Barbarian)
Feats: Toughness, Dodge
Lvl 2 Rage Chemist: Discovery (Feral Mutagen)
Lvl 3 Invulnerable Rager: Power Attack
Stat Build:
Str 16; Dex 14; Con 14; Int 15; Wis 8; Cha 10
Skills vary but heavy on Knowledge Skills.
With the Extract prepped of Enlarge Person + Rage + Mutagen (str) This means 2 claw attacks with 28 Str.