Otohime

Queen Otohime (オトヒメ王妃) was the late queen consort of Ryugu Kingdom, the wife of Neptune, and the mother of Fukaboshi, Ryuboshi, Manboshi and Shirahoshi.

Personality
While not much is known about her, she appeared to be open-minded as she tried to promote friendship between fishmen and humans.

Past
In the past, she was one of the two people who took a stand against the discrimination towards fishmen, the other being Fisher Tiger. While Fisher Tiger believed that fishmen and humans should remain separate, Otohime wished for the co-existance between the two races.

Otohime was assassinated in broad daylight about ten years ago, which led to an uproar, but her ideals lived on. She was given a burial in the Sea Forest. Her daughter missed her funeral due to be imprisoned Hard-Shell Tower to protect her from Vander Decken IX at the time of Otohime's death leding her to ten years of desire to pay her respects, while she lived with the knowledge that there were so many unspoken words between them.

Fishman Island Arc
Jinbe was visiting her grave at the Sea Forest, two years after the Battle of Marineford. When Shirahoshi arrives at the Sea Forest with Luffy and his friends, she pays her respects to her deceased mother.

Trivia

 * She's named after the Japanese sea goddess, Otohime.