I can see her being in Azumanga Dioh. The bright and cheerful attitude reminds me of Chiyo. I can maybe even see her in Sailor Moon as she reminds me of Sailor Moon.
Due to his general aesthetic and this image in particular I can kind of see him being in Star vs the Forces of Evil. He's a cute and quirky prince boy who doesn't quite fit in so I can see him getting on well in the Star-verse.