The reaction gets an immediate frown (a pout), that only broadens as Jingyi goes on. Not even the tail thwap (but wow, that's ticklish, guy!), and there's a grooooan that follows after the offer.

"I know you mean energy-" ugh!!! ugh!!!! "Okay, what's more boring than a human? What's a better word! S'not my fault humans in other worlds can have tails and cores and do all kinds of things-"

'All kinds of things' is illustrated by Tidus waving his hands around some, as he is truly a five year old whenever he has to explain what he means and knows he can't. But he'll keep out one of those hands, mimicking the palm up, before flopping it over to make a hand sandwich with Jingyi's. Staring into Jingyi with a (put on) bored expression.

"If I grow horns and a tail, it'll be your fault. And I'll look cooler."

Than you. Tidus is definitely five.