So:
Lady (former) Aventina Gloria Artemis Serendipita Locke IV (though frequently uses variations and contractions of this, along with a great many aliases.
Virtues: Stength, Compassion, Cunning, Beauty, Wisdom
Fatal Flaw: Integrity
Family motto (aspect): Safe as a Locke - For millennia House Locke were guardians of the Helios Sector, renowned as loyal servants of the Emperor, respected, admired and feared by those they protected. Thanks to their downfall, amongst the noble classes this phrase is now a byword for the fragility of power in the Imperium and used to mock those who think in their arrogance think themselves untouchable. Amongst the lower classes the name of House Locke still carries connotations of reliability and trustworthiness, as for all they exploited their power amongst the rich, they were always careful to maintain the love of the people.
Unofficial family motto (aspect): Money is the key to every Locke - This phrase has been used by and against the family Locke, signifying both their (former) immense wealth and the connections and power it brings, along with the weaknesses many family members have had for money over the generations.
Personal motto (aspect): Only the Emperor shall judge me - Does what it says on the tin. Aventina feels that only the Emperor himself is fit to stand above her and will bow to no authority save his. Since he hasn't sent her any personal commands (yet...) she will damn well do what she pleases.
How does that sound?