If I recall correctly, there's a Midrash that, consistent with the "rule of conservation of Biblical personalities", identifies Haman with one of the people who shows up in the first two chapters of Megilat Esther, in which he's not mentioned by the name "Haman." Again, if memory serves1, that person is Mordechai.
It seems to me, though, that this Midrash creates the following minor but glaring apparent narrative difficulties:
It makes sense that Mordechai wouldn't bow to himself (3:2), this being physically impossible (unless using a mirror counts), but why did he then get angry about this (3:5)? Was he really so conceited that he couldn't stand the thought of himself not bowing to himself?
Why did Achashveirosh give Mordechai the royal signet ring that he had taken from him back directly (8:2), but give his house to Esther first (8:1), for her to have Mordechai manage (8:2 again)? Did Achashveirosh trust Mordechai to manage stuff, but, for some reason, didn't want him to have his property anymore?
Could you please help me resolve these difficulties? If I can just get past these, I'll be able to read the whole Megila in the light of this Midrash with no problem.
1. Which, I admit, it doesn't always, this time of year.