"Sure, I'll help!" That's easy enough to do. Does he even know what Wangji's power was? No, but he figures the guy will explain. But first, Tidus should answer him, shouldn't he? "As for going invisible... I don't remember anything about it."

Which is probably weird, but. "I never cared about it - the fake me, that is. And going invisible around here isn't that interesting, either... it's not like I need to sneak around much."

So it's worthless on him. Something that sounds cool, but there's no real appeal in Tidus's tone, moving along easily onto the test.

"But okay. I'm going to think about you, and see if you feel anything. Alright? ..Thiiinking-!"

He needs a small lead-up, alright. Tidus shuts his eyes, and thinks about Wangji - being where he is, going to him (not a difficult task, when he's already there). But Wangji should feel a reaction; similar to when someone speaks up, a a recognisable voice, but without words or audio. It's a feeling instead; the presence Tidus, asking by feeling that request to be where he is.

...And if it's accepted, it'll work, in the only way two people already near to one another can - by Tidus blinking from where he was standing and coming directly in front of Wangji, with a possible small knock.

(The power is a work in progress.)