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- Ellen appears on the cover of Phantasmagoria of Dim.Dream along with all the other characters in that game.
- Ellen's outfit may have been the inspiration for Marisa's outfit later on in the Windows series. Her alternate outfit is even black.
- One of Marisa's Palettes in Touhou Hisoutensoku resembles Ellen.
- Her pet cat, Sokrates, is said to rarely leave Ellen's side. In fact, the only time Ellen is seen without him is when she casts a spell card.
- He is the also the only mundane cat in the game.
- He shares his name with a Classic Greek philosopher.