This was a detail about Adrien and Félix that I just sort of assumed was canon after what we found out in Representation, and it has only now come to my attention that this was in fact never canonically stated and no one else seems to think this is the case.
It made sense to me why Adrien looked the way he did, because Emilie created him out of her love and desire for a child, so of course the senti created from those emotions would basically be a gender bent carbon copy of his Mum. Félix however was not created the same way. Colt did not create Félix out of love and certainly wouldn’t have created him with the intention of looking like Amelie, so the explanation that Adrien and Félix look the same because of their Mums being twins doesn’t make sense. Not genetically and definitely not character wise.
Félix was created out of Colt Fathom’s jealousy and anger. He was jealous that Gabriel and Emilie were the ones that got to have a child, while he and Amelie were the ones actually staying loyal to the Graham de Vanily’s and continuing on their legacy. To Colt, it wasn’t fair that they got a child and he didn’t. And when that jealousy took shape, it didn’t create a carbon copy of his wife, it created a carbon copy of the child he was jealous the Agreste’s had. Félix looks like Adrien because he was created from jealousy, not because Colt wanted him to look like Amelie.
It seemed like such an obvious thing to me, and I just sort of assumed that was the canon explanation. It never occurred to me that this was something that would technically be classed as more of a theory because it just made the most sense to me. Genetically, Adrien and Félix have no reason to be identical, even identical twins don’t look exactly the same, but it’s a kids show so whatever. But then it also didn’t make sense that Colt’s child would look so much like Amelie if Félix was created from his desire to have a child. So the only remaining explanation was that Félix is a copy of Adrien, the child the Agreste’s had that Colt felt he deserved.
I don’t know. This is just what I assumed to be the case and I thought I’d share it.