* Alongside the Shadow Costumes and the Dragonfall Carnival Costumes, The Galaxy Costumes for the original four heroes were part of the Dragonfall Carnival Event as you can have a chance to win them from the Bling Wheel in the Carnival if you have an Admission Pass or purchasing them through the Big Top Bundle which also includes the Shadow and Dragonfall Carnival Costumes.
* After the Carnival Event was over, the (original four) Galaxy Costumes became available separately at the Seamstress for the price of 1,200 gems each. At some point, the price was eventually changed to 800 gems each.
* An interesting thing to note would be the difference in tone of the flavor texts between the original four and the rest - The former are quite simple and also having a little humor in them while the latter is more on adding some form of backstory to them.