Prism Grunt 166

Lei Ketamis, also known as Prism Grunt 166, is a Bug-Type specialist positioned in the Sinnoh base, working under Admin Minty. Where previously she was a wallflower, she has gained infamy among Team Prism due to her true identity - the glitch known as 'M (00) - being revealed.

Personality
166 is somewhat shy and quiet, though mostly she's just too awkward to start conversations. When not on work duty, she can usually be found in her room playing video games on her many consoles...or at least, that used to be the case.

The discovery of her true glitch identity shook her to the core, and she grew distant and bitter. The fact that she's been bound to a nearly-immobile children's toy does not help matters. She usually tells anyone that approaches her to "f*ck off", excluding Prism Grunts 8 and 637.

Joining
166 joined Team Prism with the intent of making money while she continued her Pokémon training. While she mostly stuck to herself and focused on her job, she was not unfriendly, and would be social when prompted. Despite this, she mostly remained a wallflower until her true story began.

Glitches
Late 2019, she discovered her father, Marvin Ketamis, had been captured by the Unown and taken to their dimension. The Unown informed her and her brother, Skylar, that they had taken Ketamis captive in order to punish him for his wrongdoings against the balance of nature - summoning glitch Pokémon into the real world. The Unown promised to return Ketamis if the glitches were delivered to them, and Lei and Skylar readily agreed. However, their investigations into what their father had done revealed far more of their own pasts than they wished to know.

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Ignoring their father's pleas for them not to go, they entered Ketamis' abandoned laboratory, where he had researched and summoned glitches in the past. There, they discovered the truth of his methods - summoning and stabilizing glitches by placing their souls into comatose human bodies. But by the time they realized what this meant, it was too late.

The Unown had lured Lei and Skylar to the laboratory in order to ambush them, revealing their true identities - the glitch beings known as 'M (00) and MissingNo. Lei fought viciously to avoid being taken away, trying to deny the truth, but was knocked unconscious by Grunt 6, who wanted to protect the stability of reality. The last thing Lei heard before passing out was 6's voice - "Reality is all I have left. I don't want it ruined. ...this is for the best."

Deep Web Dive
And then, it was over. Lei - or rather, 'M (00) was back in the emptiness that was the glitches' homeworld. It was a place where time did not flow, and space did not move, a place where everything and nothing were the same. Simply being there reminded 'M (00) of what it was, and the futility of trying to return to Earth. This was where it was meant to be. This was where it always had been, and always would be. For months, 'M (00) feebly attempted to reassure itself that its time on Earth was not a dream, influencing its environment to weakly resemble the world it didn't want to forget...but in the end, it was impossible to keep hold of the idea of "Lei", a person who never really existed.

'M (00) existed in that place for an indeterminate amount of time, as time did not exist. But after forever and no time at all, Prism Grunt 637 appeared in her false forest, and said he would take it home, to Earth. He reminded 'M (00) of who it was..who she was. Despite her misgivings about Ketamis' methods and whether or not she really belonged in reality, she followed 637 back to the device that would bring him, her, and fellow glitch HPoké back to Earth.

New Vessel
The moment she appeared back in reality, she found that she could barely move. Upon trying to speak, she heard only electronic buzzing and crackling. Looking out at the room, and seeing HPoké's new form, it didn't take long for her to realize - the bodies Ketamis had stabilized them in were mere Furbies. Ketamis, wanting to make up for his wrongdoings, had vowed to never use comatose humans again...but this meant Lei would never return to humanity.

After recovering from the shock of becoming an inanimate object, she now lives in bitter pessimism and frustration inside the Sinnoh base. She trusts only 637, who came to rescue her, and 8, who helps her to move about the base. She has learned to speak again, and uses voice-to-text on her cellphone to communicate with the Team.

Skylar
Lei both loves her brother and thinks he's a moron. His bold, memey personality greatly differed from her own awkwardness, and from childhood he had always been the better battler...though that could be due to his Type advantage. After discovering her own glitch identity, and learning Skylar's identity of MissingNo., she has not seen him since the event at their father's lab. She assumes he has returned to the glitch world, and hopes he is doing all right, even though she knows it's unlikely. She misses him, and part of her hopes to see him again...but the other part of her knows Skylar would abhor being a Furby even more than she does.

Marvin Ketamis
For most of her life, Lei thought her father was a little strange, but she loved him all the same. Nowadays, though, she is angry with him for all the secrets he kept, secrets that cost her humanity. She can see that he is trying to make up for what he did, but she is unsure if his efforts will ever be enough.

Romantic
166 has never been in a romantic relationship.

Prism Grunt 637
166 was responsible for introducing 637 to Team Prism, and this formed the opening for their friendship. After he risked his life to enter the Glitch World and bring her home, she decided that he alone was worthy of her trust. While stuck with limited Furby vocabulary, she referred to him as "Noo-lah", which means "friend".

Rusty (Male Durant)
Rusty was Lei's first Pokémon, given to her on her first week of school post-adoption. Rusty helped her cope with her "amnesia" and has always been by her side, even if he sometimes snacked on valuable electronics. Nowadays he has been fitted with a miniature saddle, using it to carry his now-immobile Trainer around the base.

Dash (Female Golisopod)
Like all Golisopod, Dash is prone to be a little timid, but is doing her best to overcome this. She is very reliable in battle, able to do significant amounts of damage before her Ability forces her to switch out.

Tesla (Galvantula)
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Scatter (Female Venomoth)
Scatter tends to be cautious about strangers, prefering to examine them first. Her large, staring eyes can make this examination uncomfortable for those who don't expect it. She and Archeidon are the two Pokémon 166 primarily used for flying.

Archeidon (Male Volcarona)
Archeidon is supposedly named after the Volcarona that replaced the sun in folktales. Unlike his namesake, he is very lazy, and prefers napping to saving the world.

Amaranth (Male Wurmple)
This Wurmple was just an Egg when 166 owned it. When 166 was taken by the Unown, 637 took care of her Pokémon, and thus the Egg hatched in his care. The Wurmple imprinted on him, rather than her, so 166 gave it to him.

Trivia

 * 166's favorite game series is Devil May Cry.
 * Her last name, Ketamis, is a corruption of the word "mistake".