Adding a little bit of humility to ones character can go a long way to enhance your personal power.
A great example of this is Lance Mackey, his humility makes him very likeable and it strengthens his personal power as shown in the 2008 Iditarod when he snuck out ahead of Jeff King while he was sleeping. No one woke Jeff King because of Lance Mackey’s person power.
The opposite is the case with Jeff King. He says things like, “I’m the guy people wish they could be” which definitely lowers his personal power and instead of humility he shows arrogance.