Hemiola- you have hit on an important point. I am writing a paper for the next Slayage conference and my paper is entitled "The Compassionate Savioress of the Wolrd: Tara as Bodhisattva." In Tibetan Buddhism, Tara is revered as the Buddha who understands the world's pain and who will help you to overcome yours. Tara is known in a number of forms, which are known as colors, of which Green Tara and White Tara are most important. Green Tara is a fighting but loving Tara, while White Tara is the most compassionate form. Tara was born from a tear from the beloved bodhisattva Avilokiteshvara. Tara is known for seeing people as they really are and for helping them cope with the forces that they face every day- envy, jealousy, greed, want, etc. If you look at Tara, you will find that our Tara mimics her most significant aspects. Consider:
1. Tara was the sole person to whom the savior of the world, Buffy, could confess her affair with Spike, and she was the only Scooby who would not pass judgment on her.
2. Tara was the only person who could really see the Key (Dawn) as she really was, and I should note that Tara was the person who acted as mother to a force that could have ripped the universe apart. Dawn represented the possibility of universal chaos, but was protected by Tara.
3. Tara walked away from the most powerful woman in the world in an effort to help her learn not to want so badly, even though the effort was a terrible sacrifice to herself.
4. Tara was the one person through whom the First Slayer would speak, even though Buffy knew that Tara did not belong in and was not part of her dream (Restless). How could that happen? How could Tara enter another person's dream and yet not be part of that dream? Only by transcending.
5. Tara always understood everyone's pain and took that pain on herself- as she did for Xander ("It hurts" after he put his hand through the wall in The Body), and for Buffy (later in the same episode, when she told Buffy about her own loss and how sudden it was), and for Anya (when Xander and Willow were lost in the woods and Tara sent a tinkerbell light to guide them back home).
Tara was the moral voice for the Scoobies, in keeping with the bodhisattva's role in life. She helped people with pain, better than anyone. I will argue Tara in Buffy was a respresentation of Tara the deity. To the point of even being presented as Green Tara- when she told Anya that she would have to deal with her if Anya was going to persist in trying to force Willow to use magic.
I do not think her name was selected by chance, not in a program where names are important- Dawn, Faith, Glory, Harmony, Tara, etc.
Is this not cool! :-)