Despite being hyperactive and sometimes childish, Yui can also be “jokingly” rude to her colleagues, and even throw trash talk to Hinata and the others. Her upbeat personality may have stemmed from her being paralyzed from the neck down due to a car accident when she was still alive. Although it is unknown how she died, it can be assumed that her body somehow broke down in some way.
Very cute Yui! Even her pose seems to scream hyperactivity, but she’s missing her signature shackle bracelets! Thanks to anon for sending this!