Different people find their strength in different things. For me, as a Christian, I find strength in my faith. So when I see another character also find their strength in faith, I tend to relate to them more.
One of my favorite things about the Percy Jackson world is the leeway fanfiction authors have with original characters and minor characters. One of the things I have the most fun with is what powers other characters from other cabins would have. So, instead of letting the ideas keep bouncing around in my head, I decided to make a list: