Hagar
Bruce pointed out that Hagar gets dumped on a lot but always manages to retain her dignity. She doesn't argue with the initial charge to have a son with Avraham. She doesn't lash out when she remains a slave instead of being promoted to concubine or half-wife. When Avraham and Sarah throw her out with nothing more than some bread and water, she leaves quietly. When she appeals to God, it's on behalf of her son, not for herself. She's been treated pretty badly (and I'm not saying one should stand silent when that happens!), but she manages to get by somehow.
I haven't given Hagar much thought in the past. We give high honor to the patriarchs and matriarchs even when they behave badly, but Hagar deserves some credit too. She should (IMO) have been more assertive earlier on, but she didn't lash out when it might have been justified. I wonder what the feminist torah commentaries (which I haven't read) have to say about her.

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What I find odd is when she leaves, the description seems to fit more with a woman taking her young son, not one who's in his mid-teens. So perhaps she's an over-protective mom in most ways, but didn't care to mention whatever the 'm'tzacheik' behavior was?
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1) Ishamel tried to rape Isaac. This is derived from the subsequent use of "mitzachek" in Toldot where Yitchak and Rivka are pretending to be brother and sister, until Avimelech sees the two of them "mitzachek" and realizes they are husband and wife.
2) Ishamel tried to kill Isaac.
3) Ishmael tried to get Isaac to worship idols.
The link is obvious because these are the three "yehareg v'al yeavor" sins (murder, idolotry, sexual immorality). Not sure if there is a better source in midrash for the other two.
Midrash also asserts that Hagar was an instigator in this, although there is no textual support for this.
In this light, Sarah is seeking physical and moral protection for her child.
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I think seeing the angels of God must have been a real turning-point for Hagar.
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I really should write down the d'var I gave a week ago, because I touched a bit on the Sarah/Hagar relationship in it.
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Sarah offers to Avraham to have a child by her maidservant.
Avraham goes along with the idea. Hagar's reaction is not recorded.
Hagar gets pregnant, she then alters her behavior to her mistress Sarah ina way desribed pejoratively in the text.
Sarah complains to Avraham.
Avraham tells Sarah "your servant, take whatever steps you want."
Sarah then "humbles" Hagar in a way not described.
Hagar flees.
When queried by the Angel, Hagar states that she is "fleeing" from her mistresses anger.
The Angel tells her to return and endure, because she will have a tremendous reward.
It is entirely possible to constructive a narrative out of it as the noble/raped/abused Hagar and the evil Avraham and Sarah. It is entirely possible to construct a narrative of the eager, consenting manipulative Hagar who seeks to displace her mistress. Midrash makes Hagar an ambiguous figure, so not much help there.
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You have to wonder what her version of the story would have been. (Or, for that matter, what Abraham himself thought about the feud.)
(And, as a side note, Sarah didn't die until Isaac was an adult. If Keturah was really Hagar, she would have needed divinely-aided fertility to have borne Ishmael, raised him to an adult, left with him, returned only after Sarah's death, and then had six more sons... )
See http://www.ou.org/torah/ti/5763/chayeisara63.htm