Darth Maul with his Cyborg legs like shown in Star Wars the Clone wars or the Star wars visionaries comic would fit perfectly into KI, I don’t like the Fact that KI becomes Guest character but he would fit.
Instead of a Shadow bar he could has a Force bar or something else.
I already mentioned the idea of Grievous in MKX in the old KI forum.
My variations would be General Warrior and Kaleesh.
General: He has his Cape, 2 arms, Blaster and a electrostaff
Kaleesh: no cape, two arms with 2 Lightsabers and a blaster
Warrior: no cape, 4 arms with 4 lightsabers, no blaster
What is your opinion?