Blue Bat

Blue Bat was an undercover member of the Enforcement Union and infiltrated the Black Vatican and became one of the notable disciples under Salan.

Personality
She was shown to have an unpredictable and extremely adaptable personality being a triple undercover agent. She showed a mellow and an absolute loyal side to Cold Prince, even coming up with a pitiful background to trick him, and a joyous and playful side to Salan.

Her disguise was so good that Mo Fan had never suspected her of being Salan’s disciple even with the amount of time he spent with her.

Prior to the story
She made great contributions during the Incident of the Red Mediterranean Sea. If it wasn’t because Blue Bat was not too fussy about being promoted to higher ranks or earning fame and glory, she would have been raised to one of the Cold Prince’s most reliable subordinates by now.

Kitahara Crisis
She was first introduced during Mo Fan's Infiltration of the Black Vatican's plot at Kitahara, initially shown as mellow she mostly converses with Mo Fan talking about their supposed killing records and makes no attempt to chastise him with his despicable nature towards the other members. She had informed Mo Fan about signing a soul contract in order to participate in the action.

She returned the favor of Mo Fan killing the holder of her soul contract by temporarily disrupting The Cold Prince plans and killing the holder of Mo Fan's Soul. She then passes on the message that her master is quite grateful for everything that he has done and that she will be waiting to see him after the world turns its back on him before what appears to be her dying.

New City Yucheng
She appears shortly after very much alive and latching onto Salan's arm informing her that Extradition First was identified by her brother Mu Bai and if they were to trace her placement and actions in the Casa family through Mu He, everything could fall apart including her plan against.

Attack on Ojos Institute
Mo Fan ran into her in the 9th Mound while searching for clues on the Black Vatican's attack on the Aorus Sacred Institute. She claimed her master was busy elsewhere and she is now in charge of the plan of attack as she is now combarable to the chief extraditor after taking out the cold prince. She was defeated off screen by Mu Bai and Zhao Manyan.

After her death and upon her autopsy, she was found to be an Enforcement Union Agent with the Seal of the Enforcement Union located on her backbone. She was in fact one of the earliest Enforcers to infiltrate the Black Vatican, The high-ranking authorities in the Enforcement Union had changed since then, so the Enforcement Union basically had no idea of her existence anymore.

She had hinted to Mu Bai to autopsy her before she died to reveal this fact as well as additional information to give to Mo Fan and group