A friend of Clamp, illustrator Takeshi Okazaki, created the "Rayearth" part of the title, while Ohkawa thought of the rest. At that point, Clamp had completed a "basic" idea of the plot. For the names of the characters, they drew on car names, feeling that they would be interesting and memorable for children, who might otherwise have difficulty learning the names of characters in katakana. The inclusion of giant robots gave the artists some difficulty, as the massive scale of the robots made it impossible to depict the characters and robots in the same frame. The artists also omitted the cockpit of the robots, to show their faces instead. Greatly anticipating the ending to the first part of the series, Clamp found the protagonists' initial adventures in Cephiro "really easy" to create. Ohkawa noted that, had their target audience been older or male, they would have considered stopping the series with the conclusion of part one. The second part, however, proved difficult for the group to create, as they felt as if they had "written [them]selves into a corner".
