I believe a resident of Frasier’s building was (is) black. That character’s mom, black, was a love interest to Marty, IIRC.
Cam Winston! It was awesome to see them fight.
Yes Frasier’s nemesis, Cam Winstead, lived upstairs. He was the black version of Frasier, pompous and pretentious. Cam’s mom and Frasier’s dad pretended they were having an affair just to watch their sons have a meltdown.
My favorite episode is when Niles and Frasier had to learn how to ride a bicycle, because they never learned as kids.