Event characters, or collaboration characters, are characters who did not originally come from Sdorica, but instead from other games which Sdorica has had collaboration event with. So far, there has only been one such event.
Event characters are often limited-time and are only available to obtain during the course of corresponding collaboration event.
Sdorica X DEEMO Characters
This event was available from November 7th to December 5th in 2018.
Alice could be unlocked for free by completing the event stages, collecting Music Sheets and obtaining her character minerals from the Event rewards tab. Deemo and Masked Girl were available through a limited-time Melody Infuse.