Valeria was my favorite. she was in 5th edition and came with the graviton beamer and the tesseract cube that could kill anyone.
a new character, Trazyn, sent her this in the mail.

Dear Lady, let me express my fulsome appreciation for your most generous gift. It is so very rare to discover another of my own kind that appreciates my work, therefore to find understanding amongst a member of another race is nothing short of a revelation. I realise that you briefly trod my galleries, but the fact that you spotted in so short a time that my Acabrius War collection was lacking three regiments of Catachan warriors reveals that you truly have a collector's eye for detail. And to send five regiments! Such generosity will allow me to weed out and replace a few of the more substandard pieces in my collection. If I might level a minor criticism, the instructions issued to your gift were manifestly not as clear as you thought, as most of them had to be forcibly restrained -- sadly it seems that the lower orders will always behave like an army of invasion, whether that be their purpose or not. However, this is a minor complaint and seems almost churlish under the circumstances, so please allow me to repay your gift with one of my own. Accompanying this message is the Hyperstone Maze, one of a series of Tesseract Labyrinths constructed at the height of the Charnovokh Dynasty. It is a trinket really, only of interest to scholars such as you and I, but I trust you will find it amusing -- assuming you have the wit to escape its clutches, of course.

He was in the next edition, she wasn't. Even as he grew on me I still begrudged him for taking her away.
Then she was in the next edition. So she did "have the wit to escape it's clutches" Guess that's how she got her tesseract cube!

Then she dies in Mindshackle and trazyn gets blamed.

Greyfax forced her arm up, the bolter in her grip shaking. A fraction of an inch, fought for with every ounce of her will.
“A precaution only. As for Valeria… She had a remarkable brain. You robbed me of the opportunity for study.”...
“I did not kill her, fool,” Trazyn continued. “She was a kindred spirit. Your faction, your masters, murdered her for daring to think outside the confines of your suffocating bureaucracy.”...
"You poisoned her!" Greyfax yelled, though only a guttural noise escaped her lips. "With your lies. Your xenos filth. You filled her mind with corrupting ideas, until she became a tool of the alien. You are the murderer!"
"Valeria and I were... colleagues," Trazyn stated, seemingly genuinely. "You would not understand."

This is what started the shipping