Azusa has curly neck-length purple hair and purple eyes with cat-like pupils, a curvy figure and a large chest. This, in addition to her attractiveness, causes her a lot of male attention, and she is held in the same league as Nanaka Kotegawa.
She is usually seen in casual summer wear, like shorts, t-shirts and tank tops. When drinking with the members of the club, she usually strips with them, though she never gets fully naked and still wears a bra and bottoms.
Azusa has a very playful and mischievous personality. Unlike the other female characters, she regularly drinks with the male members of the club, strips alongside them and parties hard with them while taking part in their outrageous antics. Ryuujirou Kotobuki and Shinji Tokita mention that there is no use treating her like a lady, as she is very brazen and audacious (she had no problem taking off her clothes and going to sleep in the same room as Kotobuki, Tokita, Kouhei Imamura and Iori Kitahara, in which all four of them were naked). She can also be seen as shameless, as when she forgot her swimsuit for the Miss Izu contest, she simply went on in her underwear. She can also be shown being very perceptive as she can pick up the somewhat ridiculous logic behind situations that occur very well.
- Iori Kitahara: Azusa finds Iori to be amusing and enjoys drinking and partying with him. She often teases him about his relationship with Kohei as she believes that Iori is in love with him. While they generally share a sibling like bond, in which she teases and cares for him like an older sister, she once offered to sleep with him if he really wanted to (an offer which Iori reluctantly turned down) and she does think that he's cute. Her bond with Iori is deep enough that she once invited him to have sex with her, much to his shock and disbelief. Azusa once mentioned that she liked Iori, although this can be seen as a way to provoke Aina.
- Shinji Tokita: Azusa has feelings for Shinji as her ideal man, but she doesn't make any moves on him because he has a girlfriend.
- Chisa Kotegawa: Chisa and Azusa have a friendly relationship, with Azusa and Chisa both having a somewhat mutual respect between both of them.
- Aina Yoshiwara: Azusa is shown to be friends with Aina when she was first introduced. They are on relatively friendly terms, with a sister-like bond, when Azusa teases Aina by saying she liked Iori.
Grand Blue Employees:
- Nanaka Kotegawa: Azusa and Nanaka are friends who are often seen hanging out together. Azusa has said that she is attracted to Nanaka sexually that she would like to "do" her and often tries to get close to her.
- The name Azusa means "catalpa tree" (梓).
- Azusa's surname Hamaoka means "beach, seashore" (浜) (hama) and "ridge, hill" (岡) (oka).