Hayate Girls - Sakuya Aizawa

* Age: 13, 14 with pass of time.
* Height: 142cm
* Weight: 31kg
* Blood type: AB
* Birthday: April 3

Aizawa Sakuya is a cousin of Nagi and a native of Kansai. Like Nagi, Sakuya is very rich and has a similar personality — loud, arrogant, abusive of servants, and unwilling to accept defeat in anything; Nagi is one of the few people who can stand up to her, and out of Nagi's friends, Sakuya is the one who has known her the longest. Sakuya is the eldest daughter in her family with three sisters and one brother. Her illegitimate half-brother Gilbert is one of the people who is constantly harassing Nagi for her fortune.

Sakuya is obsessed with stand-up comedy, especially Manzai style. She encourages Hayate to become a comedian because she believes that Hayate's life up to now is nothing more than a comedy.

Later in the manga, Sakuya confesses to Hayate that she wants a proper older brother, as she does not respect her half-brother Gilbert in that manner at all. After attaching the suffix -oniichan after his name, she promptly gets embarrassed and goes back to addressing him normally again.