Long ago, Chrysanthemum lived on Green Gate. When her planet got into a war with a hostile enemy and it became apparent that her species was doomed to destruction one way or the other if they stayed, Chrysanthemum came with Earthia when the latter planned to have their species evacuate their planet and look for a new home.
- Chrysanthemum was never named in the Japanese original version of Sonic X. It was only in the English dub of Sonic X that she received the name "Chrysanthemum".
- In "Cosmic Crisis", a very similar female from Cosmo's species to Chrysanthemum appeared in the flashbacks during the time Cosmo was explaining to Sonic's friends the Metarex's ambition to rule the galaxy. Though, it is debatable whether that person was truly her.