I think when I watch the first episode I am amazed at how open John was to everything! He was not negative about any of it! Innocent , yes but open. Open to the strange new species he meets , to the ship that he is on , almost excited to be among them! And he jumps at a chance to help them, he is so unprotected, and vulnerable. He does not operate on a selfish level . He extends his hand , gives his friendship to all of them , even Rygel , who actually spits in his face! And from the minute he met Aeryn, he was hooked. She beat him simple, and he makes small talk! He stole the fork just to impress her! And none of the others are as kind to him. He saves both D'Argo and Aeryn and they act like he is the idiot. From the start John was the one who made these characters blend, he was the heart of the story from the first episode. He cared for each of them as the series proceeded , he just started with the broken drd, in the end he fixed them all.