Chisa Kotegawa

Chisa Kotegawa is the female protagonist and one of the major characters of the manga series Grand Blue. She is a first year Mechanical Engineering student at Izu University.

Appearance
Chisa is of average height and build with short brown hair, brown eyes and she has been described as cute by other characters where Iori has made several comments about her body, particularly her big butt, in which he calls "spectacular".

She has the second smallest bust among the female characters and though she is conscious of it, she isn't as concerned about her chest size as much as Aina.

Personality
Chisa is initially seen as a level-headed and serious girl who takes her studies seriously. She is rarely seen taking part in Peek-a- Boo's drunken antics, usually sitting off and observing instead. Though this makes her seem cold, she actually avoids such antics because she is extremely weak to alcohol (this may be the normal reaction, as Peek-a-Boo's alcoholic beverages usually have above 90% alcoholic content).

She loves diving and is usually the most eager to do any diving related activity. She abhorred the example set by her fellow club members, and was quite hostile when her friends attempt to involve her in their antics. She is incredibly stubborn; once having set her mind on something being almost impossible to convince otherwise.

Despite being considered beautiful and getting hit on constantly in her university, Chisa is disinterested in romance. She aspires to be a diving instructor.

Family:

 * Toshio Kotegawa: Chisa's father. Not much is known about their relationship as they rarely interact with each other.


 * Sayaka Kotegawa: Chisa's mother whom she has a strained relationship. However, this is due to a misunderstanding resulted from Sayaka's inability to show her true feeling.


 * Nanaka Kotegawa: Chisa's older sister whom she has a close relationship with and she seemingly looks up to her, although she is oblivious to the fact that Nanaka is a siscon.


 * Iori Kitahara: Chisa's cousin who she initially dislikes for his tendency of being roped in most of PAB's shenanigans, particularly being drunk and naked. Despite this, they are capable of working really well together and she can sometime show a level of compassion towards him especially when it comes to his interest in diving. It is later revealed that they are not related by blood since Iori's father is adopted by her maternal grandparent. During a misunderstanding where she believed Iori to have genuine romantic inclinations for her, she grew afraid and distant as she feared their relationship would change. Despite this and many other events pushing the two closer, it is unclear if Chisa has feelings for Iori.


 * Shiori Kitahara: Chisa's younger cousin. Not much is known about their relationship other than they are quite close. Like Iori, they are not related by blood despite being cousins.

Peek-a-Boo members:

 * Kōhei Imamura:


 * Ryūjirō Kotobuki:


 * Shinji Tokita:


 * Azusa Hamaoka:


 * Aina Yoshiwara: Chisa is good friend with Aina, and the two hit it off quite well. However, she has yet to realize Aina's envy towards her.

Classmates:

 * Hajime Nojima:


 * Shinichirou Yamamoto:


 * Yuu Mitarai:


 * Kenta Fujiwara:

Trivia

 * The name Chisa means "thousand" (千) (chi) and "thread, silk" (紗) (sa).
 * It can also mean "A Thousand Soft Silk" (千紗).
 * Chisa's surname Kotegawa means "old" (古) (ko), "hand" (手) (te) and "river, stream" (川) (gawa).
 * Chisa is one of three female students in her class who is idolized by her male classmates due to the lack of females in her major.