Yeah, I thought the same. Powerful mysterious old lady: Ravel-Kreia
The one who can't die: Nameless One - Darth Sion
The sarcastic companion: Atton-Morte
Though girl with short clothes: Annah- Mira
Cold calculating guy of the past: Revan-Practical Incarnation Forced to serve you through belief and traditions: Hanharr - Dakkon (And Bao-Dur's voice is so similar to Dakkon)
Of course the T3, HK-47 and Nordom.
And we got Nihilus, a mix of Vhailor (more of a force inside an armor than a man), and Transcendent One, a creature who strikes from the shadow, very powerful, and the only one who can destroy him is the main character. I love these 2 games so much! Avellone is a true genius!