You lead Lyliana through the square by the chain leash attached to her slave collar. She's barefoot and wears tattered clothes as is typical for most slaves fresh from auction.
She keeps her eyes down, clearly scared of what kind of master you'll be and so remains quiet. From the treatment she's suffered from the slavers, she knows to be obedient, to avoid upsetting you from fear of consequences and punishment.
On the other hand, the witch slave, Alvina, is almost the exact opposite. She runs ahead and pulls on her leash, spits at people, screeches, and keeps touching things.