Heya! Thanks for asking! For JUST this year, it's going to be for drawing only. Novelists and comic artists can both join but only for drawing. Novels are very new to Tapas and new for me. I've been with Tapastic since way back. They Secret Santa was originally meant for artists and I just haven't been able to adapt it to the new comics and novels system yet.
I definitely plan to include a writer-friendly secret santa next year, just this year is for people who are willing to draw their characters and their presents. Sorry about that~