Apacci was the last of her group to warm up to Ben, initially distrusting him.
Apacci is fiercely loyal to Harribel, and Harribel, in turn, deeply cares for Apacci, treating her as if she were her own daughter.
Ulquiorra frightens Apacci to a degree due to his brooding and emotionless behavior.
Like her fellow Fraccion and mistress, Apacci has shown great ire for Nnoitra, due to his sexiest attitude towards women, and the fact that he injured her while trying to protect Ben.
Initially, Apacci was the most hostile of the Tres Bestias towards Ben from the moment they met. Even after learning that he saved Harribel and her fellow Fraccion, she's still yet to treat him as an ally.
Apacci is fiercely loyal to Harribel.