Aradia by way of Atlantis
Dave as a Muppet
Nepeta and Equius! Equius and Nepeta! Mighty and powerful El Dorado references.
Feferi is a pretty obvious Little Mermaid
John Egbert in: the Venture Brothers.
Karkat would look perfect in Treasure Planet style if I thought I could get away with a bigger nose.
I would later do a whole series of Clone High stuff.