Fragment is a recurring term in the series. They're crystal-like objects residing in people's bodies. In other words, they're people's feelings and memories. For reflectors, fragments are a source of powerful energy. If a fragment is used incorrectly, it can affect the spirit of their wielder.
In Blue Reflection and Blue Reflection Second Light, fragments have the same geometrical shape.

Example of a fragment in Blue Reflection.

Hiori and Mio staring at their fragment (From: Blue Reflection Tie).

Kokoro's fragment. (From: Blue Reflection Tie).
In Blue Reflection Ray, fragments take the form of flowers, with distinctive colors for each person.

Uta's fragment in Blue Reflection Ray
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DLCs - Gallery - Modding - Translation - Trophies and Achievements |
Characters |
Reflectors |
Hinako - Yuzu - Lime |
Hoshinomiya Girls High School |
Supporting Characters |
Ako - Chihiro - Fumio - Kaori - Kei - Mao - Rika - Rin - Sanae - Sarasa - Shihori - Yuri |
Other Students |
Hoshinomiya High |
Sephira |
Yesod - Cochma - Tiphereth - Netzach - Daath |
Other characters |
Professor Shijō - Yoshiko |
Locations |
Real World |
Hoshinomiya - Hoshinomiya High - Date Locations |
The Common |
Anger Zone - Anger and Happiness Zone - Common Tower - Fear Zone - Fear and Sorrow Zone - Happiness Zone - Happiness and Fear Zone - Sorrow Zone - Sorrow and Anger Zone |
Terms |
Common - Dark Cave - Demon - Ether - Fragment - FreeSpace! - Leap - Reflector - Sephira - Table Chat |
Media |
Music |
Blue Reflection Official Soundtrack |
"Blue Reflection" - "Overdose" - "Reflect" - "Sayonara, Waratte" |
Personnel |
Developers |
Kishida Mel |
Seiyū |
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Gallery - Translation |
Characters |
Tsukinomiya Girls' High School |
Hirahara Hiori - Hanari Ruka - Tanabe Momo - Shirakaba Miyako |
St. Ines International High School |
Hirahara Mio - Yamada Nina - Komagawa Uta - Mizusaki Shino |
Meigetsu Girls High School |
Tachibana Ryoka - Sumeragi Amiru |
Other students |
Saiki Yuri - Takaoka Yukiko - Utsubo Kokoro |
Sephira |
Other characters |
Locations |
Real World |
St. Ines International High School - Tsukinomiya Girls' High School - Meigetsu Girls' High School |
The Common |
Terms |
Common - Dark Cave - Demon - Ether - Fragment - FreeSpace! - Leap - Reflector - Sephira - Table Chat |
Media |
Music |
Blue Reflection Ray Official Soundtrack |
Personnel |
Staffs |
Kishida Mel |
Seiyū |
v · e · d |
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DLCs - Gallery - Modding - Translation - Trophies and Achievements |
Characters |
Reflectors |
Ao - Kokoro - Rena - Shiho - Hinako - Hiori |
Supporting Characters |
Yuki - Kirara - Mio - Uta - Yuzu - Lime |
Locations |
Real World |
The Common |
Oasis |
Terms |
Common - Dark Cave - Demon - Ether - Fragment - FreeSpace! - Leap - Reflector - Sephira - Table Chat |
Media |
Music |
Blue Reflection Tie Official Soundtrack |
"Blue Reflection Tie" - "Overdose" - "Reflect" - "Sayonara, Waratte" |
Personnel |
Developers |
Kishida Mel |
Seiyū |