Greetings Rebel Souljah!
While I do not share your view on Michelle Obama as being or becoming some form of savior and/or being specifically an "Ester-type", there's something, a comment on this that I would like to make, that I believe is far more important.
Which is that I think you approach and apply the Biblical story of Queen Ester (and King Achashverosh, Mordekhai, Haman, etc.) too much historical and -how should i put it- in a "materialistic" way. The story contains deep spiritual truths that we should not simplify by making such comparisons.
However, like any "type" of Biblical characters: yes, a person can have traits of that character and thus we might say he/she "becomes" that type. You see, of course not literally and not the whole of one's life; it can be for a (period of) time or even just a moment in which this "type" is clearly more on one's surface. Like reflecting what we could call an "arche-type".
In fact these "types" live within each of us; we all can have expressions of these Biblical types, reflecting them in our life. why? Because they are reflecting an inner structure and pattern that our "souls" (can) recognize. So there is a Yosef-, David-, Ester-, Miryam-, Shlomo haMelekh-, etc.- type and at the same time also an Haman-, Amalek-, Samael-, etc.- type to be found within us. And a Kayin- or Hevel-type, a Yona-, Iyov-, Dani'el-, Esau-, Yishma'el-, Yochanan-, Sha'ul-, Tzipporah-type, etc.. You name them.
Even more than this: throughout Tanakh and the B'rit haChadashah we see many Biblical characters that are representing others before them; "types" that are related and/or often a continuation of another, in order to unfold and bring us closer into deeper spiritual truths.
So although it is possible that a person can have strong characteristics that are reflecting -for instance- Queen Ester and have certain situations, etc. that we perceive as being more or less in common with her, we should be very careful in and, I would rather say, refrain from applying these characteristics, attributes, etc. from one "type" one-on-one onto just one (or few) person(s) like in this case Michelle Obama.
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