My Reina story: You've all heard me say this before, but I'm gonna say it again anyway.

When I first got into MM/H!P it was at approximately the same time that the 6th Gen joined, so keeping names matched with faces took some effort, to say the least. Reina was actually one of the first that I could actually remember thanks to her famous Wonky eye.

Another thing that was pointed out to me at the time that made her stand out was that she didn't smile in any official pics (be they solo pics or group pics). I personally found her yankii attitude/style/persona fun and cute, it was a refreshing difference from the other members.
My favourite thing about Reina: I especially love it whenever she burns and/or "sticks it" to one of the other members with a quick-witted verbal jab (like the "they're not that big" crack she threw at Sayu in the "Blunt Reina" clip posted above

).
A memorable performance: The fact that I just really, really, REALLY like this song probably has something to do with it.
A moment that made me laugh: Right now, nothing can top "Blunt Reina".
A moment that surprised me: There was an episode of H!M (can't remember the date, but I'm pretty sure it was from around 2006) where they were doing little science experiments (at least, I think that's what it was). Anyway, long story short, Reina ate a bug. Definitely a WTF moment, but at the same time, I was like "Fuck yeah! Go Reina!"
A picture that I like: Yankii squat FTMFWMF.

A video that I like: I just love the "Night Version" PV for her solo version of Memory Seishun no Hikari.
EDIT: Considering how we all know how she's more of a "cat person", I'm rather surprised at her rather tame response to the latest Pocket Morning question.
Pocket Morning Weekly Q&A (week of 12/20/2009)
Written by epifanes & Kuno, updated: 13:09, 23-Dec 2009
Question: If you woke up one morning having turned into a cat, what would you do?