To answer D‘s question, the girl on Index49 is Lum, the pretty alien-oni from Rumiko Takahashi’s Urusei Yatsura. That was one of the first animes I ever watched (along with Ranma, waaay back in the early 90’s), and I thought it was hilarious.
More info on Urusei Yatsura can be found at Tomobiki-Cho, which is also where I snagged the Lum graphic. (I wasn’t sure Lum’s trademark tiger-striped bikini was entirely appropriate, so I picked an equally endearing uniformed graphic instead. ^^,)