Not just a character of sailor moon, but
the superior way of spelling "Serena".
These "a"-spelled varieties are often sex goddesses with extraordinary beauty.
They are ultimately smarter and better-looking than other Serena/Serina sorts, and are also rarer to come across.
If you happen to stumble across one of these, consider yourself lucky and extremely gifted to have been in the prescence of such a fine creature.
-"Was that a god?"
-"No, that was simply Sarena"
-"What full lips!"
A beautiful name meaning 'princess', sister name to 'Sarah'
which is another really pretty name.
Also, the name of Sailor Moon in the english version.
"Check out that hot girl!"
"She looks like a Sarena"