With my schedule being basically the exact opposite of most GMed events I never really understood how to engage and develop my characters secrets.
Cicero started off with the ability to make steelsilk. One piece every month! This was back before resources so that was a pretty big deal though very slow burn. That ability got Eaten and replaced with the ability to see scary shadow things. That was neat, but the side effects of the ability resulted in Cicero being very unfun to play so I had him killed off. I wish I had stuck it out and figured out how to work with staff on adjusting it to make it a better experience.
Jhond’s secret was that the Smiling Shadows owed him a favor. Whenever I tried to engage with that one other PCs would say No, don’t do anything with that, and I foolishly listened and never did.
Jhond’s other secret was that he could sing better than Gianna.