kurukuru (sekai seifuku)
Little ball-shaped creatures used and possibly invented by Zvezda. They can fuse together into kaijuu (it takes a few thousands of them to form one, though), as individuals they have a form of sentience (to what extent exactly is not known yet) and can also serve as an impromptu inflatable shield (capable of withstanding a few bursts of automatic gun fire), as a hot-air-balloon-like flying device and as a magic satchel (storing a bag bigger than their usual size would normally allow). Natasha can generate them from her tears as an emergency measure, although how that exactly works, wasn't revealed.
Ambiguous tag.
The artist formerly tagged here was divided into Soutou and Kurukuru_(P!).
For some potential artists named Kurukuru: kurukuru_* search | *_kurukuru search