Best thing to do is on one character unless you really want to play two different races.

I have several characters, all different races, only 2 have 50s, I only play this one and will fantasia (the race changing potion you can aquire 1 free during sub or for 10$ each in MOGSTATION) if I really want to switch classes.

My fiancee has three characters, 2 with 50s, his main is not the one who is crafting; which he has lamented several times.

Best to just do it all on one!