Party-in-a-cup:
Human Arcane (CHA) Spellcaster 7/Loremaster 10/Archmage 3
Skills: Bluff, Concentration, Diplomacy, Spellcraft
Feats: (Two Flaws) FamiliarBonus, Empower Spell1st, Extend Spell1st, Heighten SpellHuman, Spell Focus (Any)Flaw, Skill Focus (Spellcraft)Flaw, Item Familiar3rd, Improved Familiar5th, Leadership6th, Spell Focus (Any)9th, Free12th, 15th, 18th
Cohort:
Human Divine Spellcaster 17
Skills: Concentration, Disable Device, Search, Spellcraft
Feats: Trap SenseBonus, Turn Undead1st, Heighten SpellHuman, Power Attack3rd, Free5th, 6th, 9th, 10th, 12th, 15thx2, 18th
Party face, skillmonkey, bruiser in two characters. Swap out the cohort's Turn Undead for Power Attack as it doesn't have much use in a non-Undead Heavy campaign and you free up another feat. Take an Imp for Improved Familiar with alternate forms of Choker (Grappler) and Rust Monster (Utility), abuse Divine Power and Righteous Might by taking them as spells known on both characters if you want, and so on. Pick up Armor Proficiency feats for the Divine if you want, you've got the feats for it.