Yes it is! Just fill out the forms for whichever roles you wish to sign up for (artist, merch artist, or writer). If you want to sign up as a spot artist or a cosplayer, as well as a page artist, those are included on the artist forms and you just mark them! If you want to apply as both a cosplayer and artist, just include a folder with your cosplay in your portfolio so we can look at it!
We hope this is helpful, please don't hesitate to reach out if you need more help!