Thread:Perchan/@comment-31199885-20160209145612/@comment-31199885-20160209221432

''3.3: Creating existing magic ― People can make other fanon styles of Dragon Slayer and God Slayer, but if the Slayer Style their interested in is truly unique, their variation can't be a word-for-word copy. For truly unique variations or combinations, you have to create it in your own way, not outright take from the original user. However, this only applies to the Slayers. Users are not in any way allowed to knock off other people's magic, ever. Doing so will result in a ban.''

It doesn't say anything about creating canon versions of non-slayer types, and I'm fairly certain people are able to create fanon versions of canon magics expanding upon them.