Hey Walker
I would personally choose a dex-str(str or end) build. Because dex is OP and makes u pretty much invincible if you stack it enough!
and it would totally suck as trix not to be able to hit with ur big attacks! And str or end for some base power in just some stat other than dex, because you have to be able to either kill your enemy before they kill you, or just live long enough for them, not to be able to kill you before you stack your souls and smack them...
Im sorry but i know nothing about GGK, cant help u with that one...
this is my suggestion of a build. I mainly say "dex" because i know good dex-builds can hit 100% of all attacks and dogde like 70% of non dex-builders attacks, if it is stacked properly unno! Hope this helped.. good luck making the perm