Was gonna add more to the end of this, but then I started working on chapter one of the aforementioned FNAF fic and it works just fine as a 3 panel comic. :)
Similarly to canon TSAMS Moon, Eclipse has issues regarding his emotions due to repression from when he and Lunar were in the same body. Nowadays, though his emotional walls aren't as bad as Moon, he still has some issues expressing emotions other than rage.
He hates the fact that that's the only emotion he's gotten back at full force. He can still express other emotions, of course, but doesn't feel things as deeply as your average animatronic and tends to act a bit detached. This... does cause some issues between him and Lunar.
huh, I wonder who that guy in the shadows is
Maybe y'all will get to see this scene again with his actual body and not just his eyes, if I ever do a full comic in order ;P
feel free to make your guesses