Sigma Mitsubashu

Sigma Mitsubashu, is the main protagonist of 2019 Anime "Codename : Blue Java".

History
In season 1, Sigma Mitsubashu is an average teenage girl who bet 20 000¥ on going to Nagisa high school in Tokyo posing as a boy named Sigmo Mitsubashuba, everything was fine until she falls for her class's scapgoat Subaro Impreza. In the last episode of the Season 1, Supermaruo Seinsei and her french-american correspondant Henry Deez exposes her as a girl, thus losing her bet and being excluded from her girl's group led by her childhood frenemy Nissa Dawson...

In season 2, Sigma has been grounded for 2 months for betting 20 000¥, she lost all her friends except Subaro Impreza who accepts to help her undercover as a boy for another school and to rob the bank where the 20 000¥ are.

Personnality
In season 1, Sigma was a not very smart 17 years old girl that followed Nissa everywhere along with the other girls, however, while posing as a boy, she gains more maturity and became more kind, selfless and didn't hesitate when it came to protect Subaro from Henry's bullying.

In season 2, Sigma is 18 and her humiliating defeat in Nagisa high school plus COVID-19 Pandemic caused Sigma to have PTSD but she is ultimately saved by Subaro who cheered his new girlfriend up and gave Sigma back her confidence.