I wasnt saying you wouldnt know the alignment, I was asking if it were a evil campaign how would your build differ.
Oh! If I was making an evil Character and didn't know anything else, possible options:
-Killoren Druid/Blighter.
-Factotum/Urpriest.
-Warlock/Hellfire Warlock.
-Wizard/Mindbender1/Fleshwarper (with Mother Cyst Feat)
-Bard/Chameleon/Master of Masks
-Changeling Factotum/Warchaper/Cabinet Trickster/Mindspy
-Necropolitan Dread Necromancer
-Half-Minotaur template Changeling Fighter/Warshaper/Warhulk with a spiked chain
-Telepath Psion/Thrallherd
-Healer (With Mother Cyst feat)
As for Gestalt:
-Psychic Warrior//Fighter (assuming no trouble with double Bonus Feats)
-Psychic Warrior//Psion
-Factotum//Wizard
-Rogue/Exemplar//Factotum
-Warlock//Dragonfire Adept
-Duskblade//Warmage
Once again, designs are for versitility and survivability.