I just pulled random lines with Ness saying things in either comics or funny posts. Yet if you want to add anything , do so if you'd like! (( //Cough if you can, can you add a good ole impression of how Ness says "Okay" in the end? You don't need to its just wholesome))

Ness is the main protagonist in Earthbound/Mother 2. 

"What does he sound like? I mean , it seems hard to do a voice like his if your talking about Smash bros." 

You can make him sound like whatever, he is a young teen after all.