From Wikipedia: Itasha (痛車, literally "painful car") is a Japanese term for a fashion of individuals decorating the bodies of their cars with fictional characters of anime, manga, or video games (especially bishōjo game or eroge). These characters are predominantly "cute" females. The decorations usually involve paint schemes and stickers.
I daresay it doesn't look terrible on this 180SX. If only the character depicted was an adult woman, not a child, because you know the owner has had a long session with 'Mrs Palmer and her five daughters' while looking at pictures of that character.