I said several days ago somewhere I was going to come up with an "SMA checklist." It is flawed. But it is a start. Discuss:
1. Politeness- even if you use the incorrect title, your character would at least try to address others with the right title.
2. Class- Paternalism is acceptable for high-ranking nobles. Encouraged even. All nobles should be paternalistic in regards to adventurers, and there is an acceptable level of violence against them.
3. Religion- Your noble is spiritual, and does believe in "god." You should join a religion, or else be able to give a reason why (such as a "family cult")
4. Personal Honor- Your character can be offended, especially by insults to family, personal integrity, and class. Get offended.
5. Self-Interest- Remember that your character is one of the highest ranking people on a continent. Your character is probably not satisfied just to take orders for the rest of his or her life. Be ambitious.