"So how do we find them?"
"The same way I figured out Ami was a Senshi." Usagi replied.
"Yes, about that." Ami asked. "How'd you figure that I was a Sailor Senshi?"
"I would like to know too." Luna said. "Even I had thought that Mercury was that Kino girl."
Usagi smiled broadly. "It's quite simple. Ami was a new girl who stood out, with noticeably unique personality traits and characterization. How could she have not been a Sailor Senshi?"
The sound glass shattering filled the air, with all of the girls and Luna jumping from the sound. Ikuko's voice then sounded from downstairs. "Oh poo, I broke a casserole dish!"
With everyone sighing in relief, Luna glared at Usagi. "Do that again, and I will hurt you."
"Sorry." Usagi said, before she brightened up. "Still, it's something to go on. We need to find a girl who 'stands out'. When we do, we'll certainly find our next Sailor Senshi."