I'm not sure there is a better example of poise and grace - true dignity of manner - than that displayed by Master Yaddle during the Night of Sorrow. Whilst watching over the precocious, unrelentingly mischievous, and extremely naïve youngling Cippa Tarko, she arguably single-handedly ensured the balance of the battle on Dalna didn't tilt too much toward the Path. Creighton, Aida, Char-Ryl-Roy, Enya, and others fought so heroically and indeed did much of the heavy lifting on the battlefield; however, in the face of insurmountable odds, at its most bleak, it was Yaddle's presence that was major influence in the outcome. Her experience and incredible skill in battle was legendary; but beyond her combat skills, most importantly she was a wellspring of calm for the others in the storm. Even as the greatly experienced and resolute Jedi Master Creighton Sun (who was absolutely brilliant in Cataclysm) began to succumb to fear and doubt, Yaddle was the buoy that continuously reassured and signalled hope. She seemed to keep everyone anchored in the Force.
We of course know Yaddle from the prequels. She sat on the Jedi council prior to the events of the Clone Wars. Chronologically, however, this is the first time she appears (I believe as things stand in terms of released novels and comics). In Cataclysm I feel like we got a glimpse of what a great Jedi Master she truly was.