The pout is endearing, and shows Tidus's true age. Wangji half smiles but then focuses on the information about Diagad.
"I think I also kept something from there. I haven't tested it completely yet, but perhaps you can help me." If anything, Wangji has been avoiding testing his power like the plague. Mostly because it could be quite horrible if he's wrong. "Invisibility is a mixed blessing I feel, do you miss it?"

He blinks a little and then nods, more than happy to help Tidus in whatever he's trying.
"What should I be feeling?"