Tokisada, Sachiko

サチコ・トキサダ

A 14-year-old girl who stows away on the Lady Whisker to secure Ahab's help in rescuing her planet, Moad, from the Federation and their ultimate weapon, Moby Dick.
When the crew discovers her, Lucky pleads to join them as a whale hunter. She undergoes a test requiring her to retrieve a coin from the bottom of a well filled with a liquid that causes a person to sink rather than float. Although Ahab saves her, she manages to retrieve the coin. Having proven herself, Lucky becomes an Apprentice Whale Hunter under Atre's supervision and soon earns the respect of the other crew members, including Captain Ahab.
Brave and resourceful, Lucky quickly adapts to life aboard the Lady Whisker while concealing the fact that she is a girl. However, after her secret is revealed, she begs Ahab to save her planet from the Federation, a request he accepts upon learning that Moby Dick is involved.