Athena's appearance in the anime
Sister Athena is a minor character in the 07 ghost universe. She is one of three recurring nuns who work in the Barsburg Church doing odd jobs, such as cooking, cleaning, and manual labour. Out of the three, Athena is the shortest but seems to be older than Rosalie and younger than Libelle. She is also seen in the manga once or twice, but remained unnamed.
"Athena" is the Greek Goddess of wisdom, so this could imply that Athena is a smart and/or wise person.
Athena has large, round purple eyes and light blue hair that is mostly covered.
She is always shown in her nun's garment.
As her name suggests, Athena is a wise individual. She was very helpful to Teito during his stay at the church. Her job as a nun requires her to be kind, patient and devoted to God.
She has been in the Church long enough to remember when Frau and Castor took their apprentice exam.
She looks up to Libelle, who is the oldest of the trio, and defers to her.
She has taken Rosalie under her wing, and looks after the younger nun.
Alongside the other nuns, she greeted Teito when he woke up after escaping from the military. She then continued helping him for the remainder of his stay.