The idea was basically to add a few other elements, the twin option can be interesting to use as well, but with some other elements
my only wonder would be what elements to use (kind of an elemental fan so I know quite a few raw elements like the 4 main elements) for example i would like to add 2 electric users (using the twin thing someway, one good and one following the darkness, the darkness one would get his powers from the darkness himself)
Also perhaps an ice that also is part of the darkness

those 2 are pretty simple to add as they are both direct sub paths of 2 main elements (wind and water)
But it also depends on the current fout users range, can aqua use ice as well for example

Sorry if I am not fully clear, got a lot of noise around me so its hard to concentrate, I hope I am clesr enough

and about the darkness, that was kind of why I asked if you have plans like that, I dont mind anything about that, so that he currently is using a form I can work with, no problems
and off course he can change from form depending, might be more epic if during a direct confirmation if he ends up taking a less human form for example
if you have any ideas for how dark might act and what he is planning and such, if I may use him then tell me trough pm so I can use that ad you want ^^