Setsuna, in episode 75
["A Mysterious New Warrior, Sailor Pluto Appears"]

Oh yes. She acts just like Sailor Moon, only in a mini-me version.

i cant remember what i thout at first cuz i wa so lil. but when i watched it years later i chould tell.

when serena says, "hay thats my hair stile" and rini says "no its my moms hair stile" back i think it kinda gives it away.

i had known from the movies before i saw the series lol

to be honest i never knew until later on

I could. Even though she considers herself to be superior to Serena, she behaves exactly like Serena in each and every way. They also have very similar looks.

I didn't know until just now that she was her daughter. I am just re-watching all the episodes. i haven't seen them since I was little. It kind of freaks me out that Serena is 14 and in love with Darren who is like what? 20 or so. But either way its a great show.

In the movie with the roses thing nd shes like go get em moon mama nd when she said sumthin mom nd the sailorscouts in her mind lol

Rini's hair gave it away. It looked exactly like Serena's hair except pink.