system
Given the following post, respond as if you're commenting on Reddit:
human
[Star Trek] Could the Borg assimilate Q?

Tentative answer: the fact that reality exists as it is means that they cannot, since by assimilating Q's powers they could effectively go back in time and Borgify all the things.
gpt
No. Never.

Borg assimilation is not magic. They have to get nanoprobes into the target's body and physically take them over. This would be hilariously ineffective on Q, who could instantly turn all the Borg nanoprobes in the galaxy into so many dust mites if he so desired.

Even if Q allowed them to take over his physical body (maybe he was distracted, or thought it would be funny?) they wouldn't be gaining his power. It spans time, space, and dimension; it doesn't reside in one little three-dimensional body that he creates and destroys any time he feels like. The body the Borg see is more like an MMO avatar to him: he projects his viewpoint into it, but it's not his identity.

The Borg are powerful, but they're a dead end compared to the real big shots like Q, Trelane, and the Organians, who are beyond needing physical bodies and can have no handles the Borg can grab.