Guess the character I am thinking of I will answer in yes or no.
No
He is a Chiss.
A chiss in both legends and canon who has not appeared in a live action, which obviously rules out Thrawn, Humm not my area.
Are they a part one of the chiss ruling families
Yes.
Is the family mitth
Yes
Is it Thurfian
Thooraki
What do you think?
