alienmelon (also known as Nathalie Lawhead in physical spaces) is a collective construct of everyone's mind. She only exists because everyone thinks that she is real. She began as an NPC (non-player character) in an early browser text-based game sometime in the 90's. The character was convincing enough that people eventually began inviting her to events, conferences, and other gatherings in RL. As is the case with computers, somehow some weird programming shit happened and she was able to start showing up in the physical world. She spends most of her days making games, but wishes to one day return to her virtual home, and continue being an NPC.
Interested parties can read more about Nathalie, and her achievements, here.