I gave this some thought and would have to say my favorite character of all time was Kisanth, (Written up as a NPC sub here: ) a loner mage that got involved in a conspiracy to over throw the kingdom and replace a dopple king with an outcast prince.
Unfortunately after restoring the prince to the throne is became all too apparent he was worse then the king impersonator, and attempted to disband several lesser guilds, leading to a costly war between guilds and the smaller kingdoms who supported them against the empire and their "state approved" guilds.
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Along the way she managed to get revenge upon her father, recovering lost scrolls of wisdom, and offend the entire magi guild of Antioch when refusing to accept their advice over that of her familiars regarding the path her future should take. (They wanted her to join their guild as an instructor after the end of the magi war, her familiar wanted her to return to her home in the forest with him and raise a family.)