I don't mean to start a debate, and I know this post is probably gonna get some hate, but I don't know I would want that. I don't know much about Labrys, and while I never really had anything wrong with Aigis as a character. In fact she may be one of the few characters I did like in Persona 3. However, the fact that they're robots is something that still doesn't sit well with me in this universe.
Sure, we got people summoning crazy demons with their mind, and we're fighting creepy monsters. Besides this, in Persona 4, the game is recognizable as taking place in modern times. Just so happens there's some weird freaking shit going on, but other than that, it looks like our world. Persona 3 didn't sit well with me, because it kinda looked like it took place in modern world also, but then we have fucking sentient robots, and crazy gadgets that don't really exist. It threw me off, and didn't mesh with the rest of the universe I felt.
I have nothing against Labrys and Aigis as characters, but their existence in this universe is still something I personally am not crazy about. Again, this comes from someone who never really liked Persona 3, and loves Persona 4.