Seems fine to me. Wendy (aka robot lady) is a child "trapped" in a robot body. The actress does a good job portraying that. Alex Lawther who plays Joe (aka bro) is an interesting actor, who makes unusual choices. Makes his characters a bit quirky.
I understand the child in a robot body. It just feels like sometimes they're in a different show than everyone else. I wish I could describe what I'm saying better, but it takes me out of the show. Compared to Timothy Olyphant who's odd but fits the show, at least for me. whereas the other two feel more like I'm watching a Shyamalan movie
Also the camera zooms in too much on her for my tastes. feels like I'm watching the Bear all over again
Beyond that I don't really have a problem