4 questions
1. Can I use traditional art? Or does it have to be digital?
2. Can my character be my Fursona? Or do I have to create one specifically for void?
3. Are Original Species based characters allowed?
4. Can I use my fandom oc? (Undertale, Homestuck, Pokemon, etc.)
5. What happens when a character dies? Can they be revived?
1. You can use traditional, digital, and anything in between. As long as it's artwork it's A-ok.
2. You could use a fursona as long as it's your own original design. The characters you want to put on the site are completely up to you.
3. It's not just allowed but encouraged. There's a myriad of other original species on the site, if you want to make one then go for it.
4. Fandom characters aren't really allowed. We want people to create their own content.
5. When a character dies, they cannot be used unless it's a beyond battle (Non competitive comic) or when it's October, in which they can be active during the whole month. They can be resurrected in certain tournaments should you want to revive one. Considering though that characters only die in certain types of battles, I wouldn't be too concerned over it.
I hope this answered your questions, feel free to ask more if there's anything else you're curious about.