person from (the planet of)
Suffix attached to a planet or celestial body name to mean an inhabitant of that place. Common in science fiction and fantasy contexts.
Martians are often depicted as octopus-like creatures.
The anime protagonist fights evil Martians to protect Earth.
man overly interested in women's breasts
Compound of 星 (せい, 'star, planet') and 人 (じん, 'person'). The suffix is productive in modern Japanese, especially in science fiction.