Puca, in the narration, describes him as "our oddball friend", and Oscar certainly holds some strange ideas. He seems resentful of his home, calling it a "dirty rotten town", and wants to journey through space in a space rocket  he rather impressively built over the course of five years.
Puca refers to him in the narration as "our eccentric friend," and Oscar harbors some peculiar notions. He is resentful of his home, calling it a "dirty place," and wishes to explore space aboard a spacecraft he built impressively over five years.