KOTOR TOONS

Not only these ones...
There is too old sith : Naga Sadow, Exar Kun, Dark Revan.
For those which are not sith, you can think to the Mandalorian community.

Too much possibility i would like to see in game.

I'm not seeing all those minor characters being added anytime soon, if at all. But Darth Revan, Darth Malak, and Darth Nihlus are all possible candidates. If they do end up going into that era however they would probably pull characters from SWTOR. So probably; Revan, Satele Shan, HK-55, Darth Marr, and Arcann, would be the most likely picks.

I would love Treek as the fifth Ewok though, she'd probably be a tank healer of sorts. Not a taunting tank but one that would assist Ewok attacks and heal the character she's assisting. That would synergize well with Chirpa's Tribal unity and when he grants retribution to all the Ewoks. she'd have that chance of assisting their counter attacks and healing them in the process. She'd also go well in a Phasma lead or with characters like Qui-Gon who call in assists.