A realistic full-body portrait of a superhero representing the Cancer zodiac sign, named 'Lunar Shell'. This hero has a sleek, powerful build and features a shell-like armor that is both protective and elegant, resonating with the crab symbolism. The armor should have a reflective, moonlit quality, emphasizing their connection to the moon and water. Their powers include control over water and tides, represented visually by subtle water-like patterns on the costume. The character's pose is protective yet welcoming, symbolizing their nurturing and emotional depth. The background should complement this theme with a serene, moonlit waterscape, highlighting the Cancer sign's affinity with the moon and water.