WordNet (r) 3.0 (2006):

charisma
    n 1: a personal attractiveness or interestingness that enables
         you to influence others [syn: charisma, personal
         appeal, personal magnetism]

Moby Thesaurus II by Grady Ward, 1.0:

161 Moby Thesaurus words for "charisma":
   agacerie, allure, allurement, amperage, appeal, armipotence,
   ascendancy, attraction, attractiveness, aura, authority, beef,
   beguilement, beguiling, bewitchery, bewitchment, black power,
   blandishment, blaze of glory, brilliance, brilliancy, brute force,
   cajolery, captivation, charge, charm, charmingness, clout, cogence,
   cogency, come-hither, compulsion, consequence, control, credit,
   dint, dominance, domination, drive, duress, effect, effectiveness,
   effectuality, eminence, enchantment, energy, enthrallment,
   enticement, entrapment, envelope, esteem, fascination, favor,
   flirtation, flower power, forbidden fruit, force, force majeure,
   forcefulness, full blast, full force, glamour, glory, good feeling,
   halo, hold, illustriousness, importance, incidental power,
   inducement, influence, influentiality, insinuation, interest,
   inveiglement, invitation, leadership, leverage, luster, magic,
   magnetism, main force, main strength, mana, mastery, might,
   might and main, mightiness, moment, moxie, muscle power, mystique,
   nimbus, numinousness, personality, persuasion, pizzazz, poop,
   potence, potency, potentiality, power, power pack, power structure,
   power struggle, powerfulness, predominance, preponderance,
   prepotency, pressure, prestige, productiveness, productivity,
   puissance, pull, punch, purchase, push, radiance, reign, repute,
   resplendence, resplendency, rule, say, seducement, seduction,
   seductiveness, sex appeal, sinew, snaring, splendor, steam,
   strength, strong arm, suasion, subtle influence, suggestion,
   superiority, superpower, supremacy, sway, tantalization,
   temptation, upper hand, validity, vehemence, vigor, vim, virility,
   virtue, virulence, vitality, wattage, weight, whip hand,
   winning ways, winsomeness, witchcraft, witchery, wooing