Well, I have a couple, but I'll start with Otto since he's more of a Work in Progress.
Otto has a white dad and a Moroccan Mom. I've decided on Otto being biracial for a long time, but I'm a bit torn on where his mom comes from (as I said, I'm leaning towards Moroccan, but honestly, his mom could be Ethiopian, Mexican, etc.)
This is the first design I've made for Otto's dad. He's Ashkenazi Jewish, and this may not be the design I keep for him. Dude's a factory worker. Ignore ghost dad. Ghost dad is not canon.
In Clyborne-Chatterjee, the secondary protagonist, Rin Chatterjee, has a Pakistani Dad and another dad that's white.