Similar to The Bechdel Test, a narrative is Deggans compliant when it has:
At least two non-white human characters in the main cast...
...in a show that's not about race.
If the socially dominant race in the country where the show was made is not white (say, in Japan), the first clause may need to be adjusted accordingly.
It's worth noting that Deggans Rule doesn't precisely parallel The [...] [tvtropes.org]