Some of you are going to keep sayin this until we're literally never not looking at a character while at WDW.
I've said it before and I'll say it again: for the vast majority of WDW's lifespan, it was never about being constantly bombarded with characters and branding. That's why it was good. It worked, and it wasn't tacky and didn't feel like a corporation asking you to pay money to market more stuff to you.
Let's dive a little deeper: slapping a character on something is the easiest, laziest way to "spice" it up.
You want themed strollers? Why not theme them by park? Magic Kingdom strollers could be themed like a royal stagecoach. Hollywood Studios could have, like, Hollywood theming? Or if it has to be branding, Toy Story or Star Wars themed? Animal Kingdom strollers could be little safari trucks. I get that these things have to be cheap, durable, and functional first and foremost and you're mainly limited to the fabric print and color of the plastic. But some more creative patterns would go a long way rather than just slapping characters on them.