Mysterious Waif-tan is one of JustForFun/TropeTan's many younger([[VagueAge ?]]) sisters. She is the AnthropomorphicPersonification of the MysteriousWaif trope.

Among her many mysterious qualities:

* Enigmatic half smile.
* Straight, almost narrow, ambitious-looking [[TechnicolorEyes lavender eyes]].
* Waist-length [[YouGottaHaveBlueHair cyan hair]].
* A slightly translucent, knee-length [[WomanInWhite white dress]].
* May or may not be ReallySevenHundredYearsOld. Seriously, [[VagueAge she won't tell us]].
* May or may not know WaifFu.
* Thought by some to be a WaifProphet, but to others she seems to simply be a DeadpanSnarker.
* Sometimes seen wearing a [[CreepyCoolCrosses cross made out of raven feathers]]. Other times, she is seen wearing a [[RoyalBlood golden signet ring embossed with a raven]] on a platinum chain around her neck.
* Sometimes seen with the [[FacialMarkings Chinese pictogram for tea]] tattooed upon her forehead.
* Once reported to be seen [[VoluntaryShapeshifter taking on the form of a raven.]]
* So mysterious that all attempts to picture her are [[CameraSpoofing doomed to failure]]. You are free to try, however.
* It's strongly suspected that she is, in fact, the Database, [[MacGuffinTurnedHuman captured in the body of a young girl.]]
* Unconfirmed rumors hint at a [[TheRival rivalry]] between herself and JustForFun/BlackMagicianGirlTan.
!'''Mysterious Waif-tan Fanart'''
[[caption-width:120:by Tropers/HaseoNatsume, using [[Website/GaiaOnline Dream Avatar]]]]
[[caption-width:120:by Unknown Troper, using [[Website/GaiaOnline Dream Avatar]]]]
[[caption-width:125:by Tropers/FarseerLolotea, using [[Website/{{Subeta}} SubetaHQ Wardrobe]]]]