[@Rondo of Blood]
That's fine. The Gatcha is just a suggestion system. If you want to, I'm fine writing up some casters and then spinning a wheel on that.
On a side note: The Wright Brothers are Riders only in the sense that they fly in a plane. As inventors they also fill the role of Casters, so they can invent new weapons and such. So they're more like modern casters than spell book casters.