Tuxedo Mask
Originally Naoko Takeuchi used the codename "Mysterious 2098 Face" for Tuxedo Mask. She later expressed bewilderment at herself for the idea. Although Takeuchi had designed his costume herself, she found it difficult to draw, as it had many parts to it; she often forgot to draw parts of it in the early manga. She later had the same problem with Sailor Galaxia's costume.