In the movie, there are some secret agent type villains that all appear to be identical to one another. They also repeat everything one of them says, like an echo. They remind me of Agents from The Matrix, but LEGO has no prior relationship with that property so I'm not certain. As noted in comments, The Matrix is a WB property, so it could be them. However, most of the other villains we see have already had appearances in other LEGO media, namely The LEGO Dimensions video game and related sets.
All the articles I've found (so far) only speculate that they're Agents, but I've not seen any confirmation. Unfortunately, I didn't get to check the end credits to see if they were named there.
Who are these bad guys, and what property are they from?