#out of universe he calls himself herondale because cc loves the “big five families” thing and he needs to use the herondale name

[tiredandoptimistic]

My firmest TSC take will always be that Jace should have gone by Lightwood in the end. I get that him being a Herondale makes sense in the grand scheme of the TSC universe (him, Will, James, Kit, and Edmund are all birds of a feather), but his personal arc is far more dependent on the family who raised him. Learning about his biological parents is of course important to him, but calling himself a Herondale doesn't actually feel like a resolution to his identity crisis. TMI is all about rejecting the hatred handed down from previous generations, which is why neither Clary nor Jace identify as Morgensterns. While Stephen was nowhere near as bad as Valentine, he also did even less to shape Jace into his adult self. Robert and Maryse on the other hand actually raised him for half his life, and Alec Isabelle and Max grew up alongside him as his siblings. He's a Lightwood in every way that matters, I don't get why Jace (in-universe) would choose to identify himself as a Herondale when there's nothing tying him to that family but blood spilled before he was born.

Anyways, I'm a Jace Lightwood truther for life, thank you for coming to my tedtalk