He really shouldn't tease the younger girl... but he can't help himself! Truly, the real Tidus is deep down there somewhere. Plus, it's only some fun teasing--no harm done, as Tidus pats her shoulder.

"Then great! I know they'd love you!" Absolutely! "Della's a lot of fun--and a duck! And Kitty's a blast; just as hardworking and young as you. She can go through thing! She saved a guy trapped in some wreckage last mission. Heck, I bet she saved a few!"