Final answer:
The main concern of Topher is his identity, as he expresses uncertainty about who he really is and mentions not knowing himself yet.
Step-by-step explanation:
The main concern of Topher is his identity. He expresses uncertainty about who he really is, indicating that he doesn't know himself yet. This concern is reflected in his statement, "I just don't even know who I am yet." While his readiness to be a king may be a subsidiary concern, his primary focus is on discovering and understanding his own identity.