Hey!I don't think that I will be able to find all them ,because she's got a lot of friends ,but I will try!
When I say "friends ",I mean the other ones than the sailors! =)Often, I've seen sites where there isn't a line on them!
So,Iwill try to put a little more on them...(after all ,even if they are secondary character ,they are important too!)
Naru
Osaka:
She's one of the first friend of Usagi.Since the beginning,she has always been there.
But since the time where Usagi found that she was Sailor Moon,and that she tryed to found the other scouts ,we doesn't hear about her so often .Naru try to be with her as often as before but she doesn't manage to,because Usagi is always busy now...
She's really a good friend because in spite of this ,she continue to worry about her when she see her worrying...And then try to cheer up her!
What we know about
her:
Name: Naru Osaka
She's in the same class and in the same shool that Usagi and is always escorted with Umino.(another Usagi's friend)In the anime ,they're in love!!(You will understand the exclamation ,when you see his face!!!)Naru is a really intelligent,pretty girl ,from a good family.Her mother has got the Osap jeweller's shop(which is near their school)She's got a sister too ,who have the age of ChibiUsa(They are friends) andwho is called Naruru .
In different cases ,she has been saved by Sailor Moon (when she has been attacked by the Dark Kingdom,the Dark Moon,..)
Umino ??:
With Naru, he's one of the first friend of Usagi.Even if he isn't really pretty,he's really clever and is a real "Otaku" of studies.Always knowing every answers in class and the last news ,Umino can't be catch out on the subject.It helps Usagi because it's often him who teach her what is happening around her....
What we know about
him:
We know nothing on his private life except that he has a friend "Suri Kurume"(alias Mercurius) that is as clever as Amy.(She will fall in love of him without having ever see him(it's not really a bad thing ,because he's as awful as Umino!!!)
P.S:In the anime ,he's also in love with Naru!!!(yurg!!!!)