In Baldur's Gate 1 only the Demon Knight had Power Words. In BG 2 normal characters could have them but they SUCKED, since Magic Resistance blocked their effects almost all the time.
In fact, almost all the 9th Level Wizard Spells, and most of the 8th Level spells sucked as well. Outside of the exceedingly broken Abi Dalzim's and Chain Contingency most of those spells were only of use against characters from the first chapter, but they weren't available until the game was almost over.
Also, here are the portraits for Lelouch. Just in case someone wants 'em.