I think not only she was supposed to have a bigger role, but she was set to be the Moon Princess, before Naoko decided to make the whole reincarnation part of te story, and giving that to Usagi. Naru is considered pretty, lady-like, she is wealthy and she lives in a jewelry store. The princess herself was from the begging said to guard the Silver Crystal by Luna from the day one. The anime turned her into someone to constantly be in needof protection, while the guardians are supposed to protect the princess. And the thing that really makes this was the original plan for her is her name. Naru which can be an anagram for Runa or Luna.
Another possible role set for her was that she was supposed to be Sailor Saturn. She was the only character, besides the guardians and Mamoru, to be given a birthday 1st of January, which makes her protected by Saturn. And we know that the rest of the characters birthdays were chosen to reflect teir planet.
What theory do you find more likely? Do you have your own theory about Naru? Or you might she is what she has always been - just a friend of Usagi that ended up forgotten.
Another possible role set for her was that she was supposed to be Sailor Saturn. She was the only character, besides the guardians and Mamoru, to be given a birthday 1st of January, which makes her protected by Saturn. And we know that the rest of the characters birthdays were chosen to reflect teir planet.
What theory do you find more likely? Do you have your own theory about Naru? Or you might she is what she has always been - just a friend of Usagi that ended up forgotten.