Aon is the lead male character of TO - Symbiotic Planet.

Aon is working as a researcher from US-Euro Research Facility. He is working on some particular fungi in the planet which, based on the results of his research can become a new place for establishment of a major human colony.

He has been secretly meeting Elena, a beautiful female interpreter from the United Eurasia Research Facility, a rival facility of his own, while doing his researches.