Trilla Suduri was a Jedi Padawan turned Inquisitor called Second Sister.
Second Sister debuted in the comic Darth Vader: Dark Lord of the Sith 19 which featured many of Vaders Inquisitors. Her backstory as Jedi Trilla Suduri was revealed in the video game Jedi: Fallen Order.
Second Sister can also be found in the comic series Jedi Fallen Order: Dark Temple.
The video below has all of Trilla/Second Sister’s cutscenes from Jedi: Fallen Order.
Elizabeth Grullon (who I interviewed earlier this year) voiced Second Sister and performed the motion capture for Jedi: Fallen Order.