Fighte/Rogue (Thief) is a classic since 1st edition and in 3.5 with Prestige class you can do almost anything in this way.
I remember a Balrog who struck our Fighter/Rogue 8/11 fighting with 2 weapons, missed his save and resistance vs Holy aura, was blinded, lost his dexterity and died in one round...... way too much 6 sided dice 
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