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A single sentence has been resonating in my mind from Kill Team Annual 2019.

In the Flexible Doctrines section clearly suggests building on characters from favored books, movies, and television programs.
I would seek to take this even further, for casual games if nothing else. Building specific teams that do not currently exist, and are drastically removed from the current index of models.

The question, then, is one of balance. For the sake of my opponents, I must find a way to give appropriate points costs.
And while sometimes, points make perfect sense (a T3 model is cheaper than a T4); other times, the advantage granted by an item vastly overshadows its point cost (the Auspex is 1 pt.)

This is why I ask if anyone knows of reliable resources for crafting homebrewed Datasheets, so that I will not be going from scratch.

first you have to ask your self, are my opponents willing to play against my created datacards

 skeleton wrote:
first you have to ask your self, are my opponents willing to play against my created datacards

While I share your concern, this is less of an issue at present, due to a lack of an FLGS being open in my region. None of the players in my group is ever going to be a tournament-level player.

To clarify:
My friends and I were looking to Kill-Team as a narrative style of 40k, and the personalized team members seemed to be falling just outside the scope of RAW. We're not trying to make the T-1000, Neo, or Caiaphas Cain... Okay, maybe Cain. But if they allow Marbo, why not Cain?

Our thoughts of homebrewing had actually started with the idea of whether you could include the tragically underrepresented Noise Marines in KT, and how we'd balance their weapons.
Simple thoughts on the surface, but we want to be fair with such things.

There are a lot of things that look like they'd fit into KT, but have been left out. The entire Inquisition (barring the Sisters of Battle&Silence) comes to mind. And that's what I'm trying to develop.

You'll just need to come up with points values and playtest it out a bit. Try to find some datasheet with as close a match of the stats as you can, and compare its points values, tweaking from there.