Seryu Ubiquitous

Seryu Ubiquitous was a member of the Jaegers, formerly of the Imperial Police. She was a young girl with a strong (and twisted) sense of justice. She was the owner of the Teigu, "Hekatonkheires" until her death which also resulted in the destruction of the Teigu.

In A Time in the Universe, she is one of the primary antagonists in Season 1 with Cao Shuang.

Personality
She may be the Soldier of Justice but in reality, she is actually a ruthless, violent and dangerous soldier that puts too much effort into separating right and wrong. Prior to the events of A Time in the Universe, She even went to extreme lengths by killing almost every single researcher in the Cove facility on Chorus in search of the Portal Device; the only thing that can right the wrongs in the multiverse. This was when she developed an eternal hatred for Michael J. Caboose, one of the heroes of the New Republic.

Despite this, she doesn't like parties and only gets the job done. This is possibly shades of her tomboyish side.

Role in the Story
2 days prior to the events of Season 1, she was sent to the world of Red vs. Blue by Malcolm Hargrove. It was then that Hargrove told her about the Reds and Blues. At first, Seryu praised the group but Hargrove also told her that they are criminals and Caboose is the one that is considered the strongest soldier in the world despite his low intelligence. Enraged, Seryu agreed to Hargrove's terms, joined with Cao Shuang, a soldier of Wei, and set off to destroy Michael J. Caboose...

(TO BE ADDED)