Monk 20//Paladin 20 WITHOUT Cha-mitigating feats.
Also, TWF fighter 1/changeling racial ACF feat rogue 1/fighter 18 with Imperious Command and Able Learner to act as the party's skill-monkey and face. Needs Str for damage (cuz no sneak attack), Dex for AC and TWF, Con for hp, Int for skill points, Wis for Will saves and skills, and Cha for party face skills.