All things considered, I can see why Old Lace would be omitted.
One important creature that is missing from the Runaways first look (as posted on the official Twitter page) is Gert’s dinosaur, known in Marvel lore as Old Lace.
In the comics, Old Lace was considered a velociraptor before being correctly identified as a Deinonychus, and I know I was looking forward to see if and how Old Lace would be involved in the Hulu series.
Her absence from the first look is disappointing, as it is pretty much a fact that dinosaurs make everything better, but the tweet’s mention of a velociraptor emoji indicates that Old Lace will be a part of the show, even if she wasn’t featured in the photo.