all right for the many mini ideas i have ill try to keep it concise
a better Ahsoka Tano
a better Ferus Olin
clone trooper commander Faie (one of the clone commanders from cotf)
Quinlan Vos, seperatist agent (use quinlan from a&e)
another Maul in the Sith faction (maul from cotf)
lumiya, imperial spy (i dont know who to use for that though)
a yoda with force renewal two (yoda from rots)
Jango Fett, Mandalorian warrior (in mando faction mini from cs)
Darth Vader, Redeemed (Vader from kotor)
Darth Revan, Redeemed (Revan from cotf)
Darth Revan, Master of the Force (revan from cotf with master of the force and force renewal two)
Bastilla Shan, Jedi Warrior (i have no idea who to use though)
Bastilla Shan, Sith Aprentice (no idea again)
Alec, Jedi Knight (i have no clue just dont use Darth Malak from kotor or from cotf)
Luke Skywalker, Dark Jedi (use luke skywalker, jedi master from universe)
Darth Maul, Redeemed (use the maul from cs)
Zayne Carrick, outlaw (use zayne carric from kotor but this time, make him better please)
Ben Skywalker, Galatic Alliance Guard soldier (use the ben skywalker from i dont know what set it is from)
Jacen Solo, Galactic Alliance Guard Captain (use Darth Caedus from lotf)
Danni Quee, scientist (ckzerka scientist from loft)
Atticichuk (MeruMeru from dt)
Darth Tyrana (Kreia from kotor)
YVH droid (juggernaut war droid from kotor)
General Kota (use kota from tfu)
these are a few suggestions that i have come up with. i hope you find some you like