what are the restrictions?
Please don't make porn smilies, gore, or anything people just generally do not want to see with their eyes in most circumstances.
can we use copyrighted characters?
Limitations apply but as long as it isn't directly infringing on copyright, it is acceptable.
what about emojis from other places like discord or aol?
Above applies with copyright but there should be no issue. If you do submit a collection from another service, you probably won't be the one selling it for tokens, but we'll give you 25% of the initial payment just as a thanks. If you do some extra modifications or porting work to make it work though, there is no issue.