I would say yes to the oblique, but only a smudge of red on a dominant male. No to nyererei, they are very aggressive. When I had them with all male they were very pale. When I had them with mbuna they were almost black. In a species tank with their own females they were brilliant.
The Ruby green is 50/50. Some report them as aggressive, some report them as timid. I had them in a species tank with females and they never colored as well as I expected.