Crysta is a fictional character from the animated film "FernGully: The Last Rainforest," released in 1992. She is a fairy who lives in the rainforest and is dedicated to protecting her home from environmental threats. Crysta has the ability to shrink in size and communicate with animals, showcasing her connection to nature. In the film, Crysta teams up with a human named Zack and other forest creatures to combat the destructive force of Hexxus, a villain representing pollution and deforestation. Through their adventures, Crysta emphasizes the importance of environmental conservation and the need to preserve natural habitats.