What are my characters afraid of?

Khadgar is afraid f failing everyone around him, of succumbing to fel if it ever shows up in Drift Fleet

Ezri biggest fear currently is being overwhelmed by the other Dax personalities. Even if she knows that's not going to happen by this point. She especially doesn't want to end up becoming like Joran

and she's afraid of not contributing anything of worth to the Dax legacy.

Ciel is afraid of not getting his vengeance, in a way. And of being abandoned because of his lies over the past several years.

He's also afraid of when Sebastian is going to eat his soul, what's waiting for him, since he's had a few years to think that over and one close call