A twi’lek girl found by a Sith lord. A twi’lek girl shunned by Darth Ravage and his traditionalist brethren for being something other human or pureblood. She was trained regardless by her progressive masters (progressives…am I right Harkun?) and grew into a powerful Sith lord. Much to the chagrin (not chagrian, you filthy progressive) of Ravage, she was made a commander of a legion of Imperial forces. She survived the great intergalactic war, but fell to an empire that has proven superior thus far.
If you pay attention to the trailer, as she is defeated, you can see Ravage in the background jumping up and down screaming, “I told you so!!! Bloody progressives!!!!”
This is the true story - with what limited information we have - of the mysterious red twi’lek from KOTFE trailer.