In the past, she has often been perceived as the tomboyish member of the group, due to her voice, manners, and hobbies. Furthering this perception of her masculine side, Yoshizawa's first lead came in 2001 with the release of the single Mr. Moonlight ~Ai no Big Band~, in which she played a dashing playboy character. She has since managed to mostly overcome this, as many view her as having matured out of her formerly tomboyish character once having assumed leadership of Morning Musume in 2005.
Yoshizawa became the Captain of the Hello! Project futsal team, Gatas Brilhantes H.P. when it was formed in September 2003. The 5'5" (165cm) midfielder has since managed to lead the team to victory on many occasions. Yoshizawa also convinced fellow teammate Nozomi Tsuji to remain as the team's goalkeeper, despite her graduation from Morning Musume in 2004.
In April 2005, after the sudden and unexpected departure of Morning Musume's then-leader Mari Yaguchi, Yoshizawa, the current sub-leader, became the group's new leader. After Rika Ishikawa's graduation in May 2005, Yoshizawa became the last remaining member of her generation.
On May 6, 2007, Yoshizawa graduated from Morning Musume after the band's last performance in the ~Sexy 8 Beat~ Spring Tour, which took place in Saitama Super Arena in Hitomi's hometown. According to several news sources, producer Tsunku, and Yoshizawa herself, she will enter a solo career of her own. At the time of her graduation, she had the second longest tenure of any Morning Musume member of 7 years and 21 days (although she was surpassed by Takahashi Ai and Niigaki Risa in September 2008). She was also considered by some fans to be the last trace of the "Golden era" of Morning Musume. She is also, as of September 2008, one of only four members to remain in the group for over 7 years (the other being 1st Generation member Iida Kaori and 5th generation members Takahashi Ai and Niigaki Risa).
Currently Yoshizawa is focusing her time on Gatas Brilhantes H.P., along with being leader of a group formed with fellow members of the futsal team called Ongaku Gatas.