Sienna is my shiny Celebi.
As a character, she's the equivalent of a hacked Pokemon - An artificially created lifeform/robot.

Robin created her after suffering from having a bad adoptive father and a bad biological father, so he wanted to prove that he would not be like either of them.

Robin choose for Sienna to be a shiny Celebi because he knew his trainer was more likely to let him keep it because of how much she likes shiny Celebi and knows that she may never have one otherwise.

View Lineart Here
Posted 24th August 2017.
Sienna belongs to me.
Celebi belongs to GameFreak.