Being a preteen/young teen, Susie has a snarky, sassy attitude. she is stressed out and overwhelmed with her parents moving out and being neglectful of her and Pump, as evidently shown in a group of 4 family photos where the Wonder family was together, and as time went on, the parents got stressed from their own work and left their children with their grandfather, Mr. Wonder. Mr. Wonder can't always be there for his kids, Susie seems to be responsible as the eldest sibling.