April Bikirk serves as the first officer of the titular starship in the anime Sol Bianca. She is characterized as a highly skilled pilot and an exceptional marksman, often taking on the role of the ship's primary fighter and protector. Her personality is defined by a headstrong and honorable nature, frequently compelling her to fight on behalf of others in need. While she is generally thoughtful about her actions, she can become just as impulsive as her crewmate Janny when cornered in a difficult situation.

Within the crew dynamic, April often assumes the responsibilities of a leader and maternal figure, particularly when the ship's nominal captain, Feb, is not sober. She is deeply protective of everyone on board the Sol Bianca. Her background includes being one of the two crew members, alongside Feb, who originally discovered the Sol Bianca itself. She is visually distinguished by her short blonde hair, blue eyes, and her preference for wearing red battle armor. Her favored weapons in combat are typically a laser whip or knife, as well as a pistol.

In the later miniseries Sol Bianca: The Legacy, which serves as a re-imagining rather than a direct continuation of the original story, April's role evolves significantly. In this version, she is the one who inherits the control pistol, recovers the ship, and becomes its owner and captain, stepping into a more definitive leadership position than she held previously. The core structure of her personality remains consistent with the original, though the 1999 series presents the characters and their relationships with a darker and more complex tone.