That Super Friends appearance is typical of E. Nelson Bridwell's work. No character was too obscure, odd, or embarrassing for him to use, and he always played them absolutely straight. I suppose after coping with Wendy, Marvin, and the Wonder Twins, treating Nubia seriously was a piece of cake. ;-) There's actually the germ of an interesting idea here, with Nubia fulfilling the same ambassador/activist role in Africa as Diana does in America. But everyone else preferred to just sweep her under the rug, and you really can't blame them.