The creators of M3gan are totally Portal and Portal 2 fans. I had a feeling when I watched M3gan, but after watching the sequel M3gan 2.0, I’m convinced.
The robot villain-turned-ally M3gan has a distortion in her robot voice that’s very reminiscent of the voice of GlaDOS, the robot villain-turned-ally of the Portal video game series. M3gan’s character arc from M3gan to M3gan 2.0 matches GlaDOS’s from Portal to Portal 2, and M3gan singing pop songs inappropriately matches GlaDOS unexpectedly singing the closing theme to both Portal games.
As for the movie itself, it’s great and about as good as I remember M3gan being. Among other satisfying action, comedy, and storytelling beats M3gan 2.0 features, the villain printer company Xenox having super advanced AI is hilarious.