Neptune in the same sign as the Sun or Moon indicates that intuitions and hunches—or delusions—dominate; there is a need to rigidly hold to reality.
In the same sign as Mercury, Neptune indicates sharp sensory perceptions, a sensitive and perhaps creative mind, and a quivering intensity of reaction to sensory experience.
In the same sign as Venus, it reveals idealistic and romantic (or sentimental) reactions to emotional experience, as well as the danger of sensationalism and a love of strange pleasures.
In the same sign as Mars, Neptune indicates energy and intuition that work together to make mastery of life—one of the signs of having angels (or devils) on your side.
When in the same sign as Jupiter, Neptune describes an intuitive response to opportunity along practical and money-making lines.
In the same sign as Saturn, Neptune indicates intuitive defense and attack on the world, which is generally successful unless Saturn is polarized on the negative side; then there is danger of unhappiness.