Nu-13

v-13, more commonly known as Nu-13 or simply Nu, was an enigmatic being, possibly an Angeloid, who claimed that her duty was to punish beings who tried to disturb the natural order, in addition to Great Beings who misused their powers. Nu-13 was at least partially affiliated with the Order of the Great Beings before the Uterio War, but went into hiatus after the war to focus her attention on other threats to the multiverse.

Description
Nu-13 resembled a small, silver-haired humanoid girl. She wore a skintight jumpsuit over her pale skin, and the Azure Grimoire, a powerful weapon that took the form of a mechanical red lock, over her left eye. A massive decorated sword accompanied Nu wherever she went that would sometimes pierce the ground behind her and move independently of her. This sword could also turn into a portal that could transport Nu to other locations. Although Nu's exact nature was unclear, she was once described as a "combat Angeloid" and was referred to as a "strange construct" by Serrator on a separate occasion, implying that Nu was an artificial being.

In her default state, Nu's personality was that of an utterly emotionless girl who spoke in a detached mechanical tone and was solely focused on her perceived duty to maintain equilibrium across the multiverse. However, whenever Nu came into close proximity to Klak or was otherwise reminded of his existence, her entire personality would suddenly change to that of a manic yandere girl brimming with emotion. In this state, Nu could be seen to have become obsessed with Klak after an unseen past event in which he had apparently "saved" her from something. In addition to Klak, Nu appeared to enjoy food and quiet surroundings, but disliked gum and loud noises.

Duel with Naju
After Nu-13 identified Naju as a rogue Great Being, she confronted him while he was already in a severely weakened state and attacked him with the Azure Grimoire, injuring him even further.

A Bad Omen
In 150,082 CMT, Nu-13 materialized on Earth's Moon in front of Blackout, Serrator, and Octoroo with the urgent message that their help was required to defeat Jack Noir and Lord English. When Blackout asked Nu who she was, Nu cryptically replied that she was an "agent of higher powers". However, Blackout was dissatisfied by the vagueness of Nu's answer and the fact that she appeared to be no more than a messenger, explaining that he would either speak to Nu's master or neither at all. At Blackout's insistence, Nu revealed the identity of her master as Akasha itself, demonstrating her allegiance by briefly opening several cracks in reality that allowed Akasha's light to bleed through into the area. Blackout was so intrigued by the reveal of Akasha that he agreed to help Nu, so Nu informed Blackout that he would be contacted when needed and teleported away.

Soon afterwards, Nu teleported to Malchior IV to warn Klak about the threat that Jack Noir and Lord English posed to the multiverse. In the exact moment that Nu's scanners detected Klak's presence, her usual stoic personality suddenly shifted to that of a yandere girl, and she threw herself into his arms, exclaiming "I knew I'd find you again". Although Klak tried earnestly to explain to her that he had no idea who she was, Nu decided to brush off his confusion as a joke and 'humored' him by mentioning an unseen past event in which Klak had supposedly saved her life. Nu then explained that Jack Noir and Lord English had become such a threat to the multiverse that she had been sent to warn "the usual guys who handle things like this", such as Klak, Blackout, Ynot, and Zev Raregroove. Having successfully warned Klak, Nu was promptly sucked into a portal that transported her away.

The Mazkertis Paradox
In 150,084 CMT (Day 2 of The Mazkertis Paradox arc), Nu-13 accompanied several members of the Conquistadores Guild to a bar on Hei Fon 4 for a meeting with Kakamu and Nadle, two representatives of the Claws of the Phoenix. Nu spent almost an hour trying to convince the Conquistadores to help her on a mission to steal Klak's toothbrush despite protests from Prudence Franklin that Makuta rarely needed to brush their teeth. When Nadle informed the gathered Conquistadores that Mazkertis had escaped from his prison, Namah announced that Nu-13, Prudence, and herself would go with the Claws to recapture Mazkertis while the others would wait as backup.

On Day 4, Huriel was worried that the death of TPK two days prior would disrupt the Order of the Great Beings enough for Nu-13 to want to interfere in their affairs again, even though she went into a hiatus after the Uterio War. This was one of many concerns that led Huriel and Orion Pax to decide to work on a plan to reinstate Angonce as the leader of the Great Beings and restore stability to their empire.

By Day 76, Nu-13 had joined the faction of Claws of the Phoenix members that was commanded by Kakamu.

Abilities & Powers
Although the full extent of Nu's powers have not yet been demonstrated, the powers she has displayed seem incredibly potent. She appeared quite powerful, as she was able to go toe-to-toe with Naju, even though he was severely weakened at the time.
 * Time Travel: Nu claimed that she could use time travel to go to any point in the past or future. However, she could only travel to the past or future of the exact physical location she was standing at.
 * Universal Travel: Nu once stated that she could freely teleport to any location in the current universe or any adjacent universes.
 * Azure Grimoire: The Azure Grimoire was the strange lock-like device over Nu's right eye. It contained enough power to injure Naju, who, even though he was severely weakened at the time, was still a Great Being.