The truly compelling trait is not external appearance, but a person's stable and strong sense of self-esteem.

People with high self-esteem internally possess a clear and solid self-evaluation system, which prevents them from being easily carried away by emotions when facing external judgments, offenses, or conflicts.
They do not lack emotions, but are able to express them in a stable and moderate manner: neither suppressing nor losing control, and never repeatedly dwelling on what has already happened.
Because of this, they can often quickly detach from their emotions and shift into an action mode of "how should I respond," while expressing genuine feelings and clearly establishing boundaries.
This kind of reaction, which is both self-consistent and measured, naturally garners respect and awe from others, thereby forming an inner and outer personal charm and aura.