Cyberchase: a latina and a black girl make up 2/3rd of the main cast.
Dragon Tales: latino and bilingual humans and dragons, a dragon in a fucking wheelchair because she has a congenital deformity, later a new kid added to the main cast who was nonwhite latino and iirc an immigrant
Dora the Explorer...fuckin...duh.

Maya and Miguel: all about hispanic people, mexican-americans, even afro-latinos
Arthur: Many characters who represented different ethnic, religious, and cultural groups, kids with all kinds of disabilities like autism, blindness, dyslexia, speech impediments, anxiety and panic disorder, had orphans, latchkey kids, and homeless people, and showed important characters getting gay married or dealing with class disparity.
Liberty's kids: had a black freed man as a main character as well as an orphaned immigrant who was also a victim of human slavery.
Shit even the cast of Clifford. T-bone and Cleo were coded as hispanic and black, respectively.
Even of the less diverse shows coming out of the UK we still had Angelina Ballerina integrating romani and migrant workers into the cast as well as characters with birthmarks they are bullied for, and god damn Piggly Winks having Ferny- a bilingual hispanic half-orphan immigrant.
Obviously I'm too old to know shit about Word Girl and Martha Speaks but the main girls in those are also...?? Whatever race they are.