Online- Wuppie (tis one of your only options really..) irl- Michelle, Wuppie (yes it's true), Mies, Mimi etc etc.
I go for Quica. Sometimes by Dorah, Caramela or Xixa (this nickname was given by my brother when he couldn't pronounce my name), either online and offline.
Alexandria, Oune, Easkyla, Ounegoneziea, Skyla, HEY YOU!
;D
Offline: Tissa, Tiss, Sa, Issa Two (to go with friend Issa One), T. (by friends A. and C.), Gip (Thai nickname), Mutt (Grandpa's nickname for me), Jersey.
Online: ForTissamo, Forte, Ajintu, Jin, Jinny, Jinnybear, Jinnybean, Philosofish, Fish, Darling, Darlingthing, Sayle.
I've had so many other screen names, though; these are just names I've actually been called. :)
Offline: Erin, Bodes, BeagleButt
Online: Lila, Issy, Lilissy, Erin, ismark, Mark, lego, legolas, cutty(lol)
In real life: Kelsey, Kel, Kay, Kels, KelKel, Chocolate, my last name and thousands of variations of it.
Online: Kels, Kelsey and customizes.

In real life my name is Tori. And... that's basically all people call me lol. Four letters doesn't leave much room for creative nicknames ): And I hate it when people shorten it to 'Tor'. That just sounds nasty and masculine.
Online I've gone by Cityvoices, Tendons, Posh, and Blir.
Online, I go by primarily Woof or now Sherbet. Woof was a name I came up with when I was 9. My neopets account was woofwoof96, and the name 'Woof' has stuck to me ever since. I don't know where the hell I got it from, but I can't ditch it now, I've grown too attached to it.
Offline, I go by 23753250 different names. Stephanie, Steph, Stephy, Stephdog (a name one of my Boys&girls Club counselors gave to me when I was in second grade because I loved dogs, now my dad calls me that sometimes), 'That person who won't talk' 'that person who draws really good' a whole bunch of other things, and some people call me Woof out there :p
Offline I go by Lylli (real name) or any of the following: Sunshine/Sunnie, Dollie or Chickee/Chickadee.
Hmm.. Moh online and off, Echo, Ed, disorderedchaos, dchaos, DC, and for awhile I was called Pan offline. Soo, lots. xD
Offline, I've been called Pao, Paolo, Paopao, Paoie. (Yes, Paolo is my real name but I really prefer my second name, Enrico. ;D)
Online, they know me as Umbra, Enrico and Provocateur. c:
online: silver, flame, silvey, sf, merc, real life: mercury( high school nickname) and the reason behind my subeta username( mercury was taken).
chinese nicknames: TingTing, little winter melon, little sister( I am the youngest in my family) :/.
Variations of Zemora - Zem, Zemmerz, Zim, Zimmy, Zemmie, Zemmerlicious, Zemzas, Zemsta, Zemoramancer, Zemz, Zemzem, Zeze,
Offline - Jessy, Jessymessy, Horrifica, Little J, Jess, JJ, Jessa, and hundreds of variations of Jessy. And mom calls me "Bookie"
Offline: Gerbil (because a friend in middle school misheard me and never let it go), Christen, Chris, Chrissy, Christy, any mis-pronounced variation of 'Christen', Sissy, Little Sister.
Online: Kitteh, Minxii, WickedKitteh, WickedKitteh of Oz, SadisticNinja