1. He's the product of... well, nobody gets to know. Sirius and he are lucky to be as well off as they are.
2. He's a hypocritical fool, catering to his parents and House trends while deploring them.
3. He wishes Sirius and he were closer.
4. He hates being alone.
5. He hates being trapped.
6. He wants power, but only to compensate for his other desires.
7. He enjoys cheap mysteries.
8. He felt slightly light-headed during the incident with Remus.
9. He's afraid of Severus Snape from time to time.
10. He really wants somebody he can love and trust, but he doubts he will ever find somebody.