Well Wriggle, the only thing I can think of is Hoenn, but I think SUSTIC said something about Clockwork Voyage. Something about pirates and an airship battle and Mard.
Well what I would do is I would make him younger, don't make him as powerful (tone down his abilities, maybe give a few weaknesses as well), and change up the backstory a bit. Also change his personality and all regarding to him being a teacher and try and rewrite it in the way you would if you were making him as a student the first time around rather than a teacher.
That is all I can say really. You can change whatever you want to make it seem more fitting as a student rather than a teacher.
Okay. Do I still keep Toten Larm or do I keep that as a hidden ability?
And final question, can all that happened in the past still happen only in a shorter time span in years? Like two years should be enough, he would be 21 at the point he enrolled.
Okay the whole Toten Larm thing I can allow, but I would be very careful with it, and probably put some limit on it like he is unsure of how to properly use it or some limits to it.
As for the backstory that can be potentially done. Just make the app and I will see.