Some look like hybrids, it's very common with haps and peacocks these days. Been 20 years since I kept Malawis, so I remember some Aulonocara (peacock) species and populations, others not so much, so I'll take a couple of easy ones. # 4 is a sunshine peacock, more than one species/population goes by the name, they're very similar, individual specimens vary, and they're often mixed, so I won't guess which one. Imo #2 looks likely a hybrid with Sciaenochromis fryeri (electric blue hap-- technically not a peacock, but a lot of people don't know the difference and there's a lot of hybrids out there-- used to be S. ahli, but was reclassified and ahli is now a similar but different fish, less colorful). Mine typically dominated the peacocks, so that's not a surprise. #3 could be the same imo, either not as dominant and colorful, mixed with a different peacock, or same mix but hybrid offspring from the same parents often vary in appearance between both species. If I had to guess, my guess is there's some Aulonocara maulana (bi-color 500) in the mix. 5 looks like a strawberry peacock or one of its iterations, a man made fish through crossing, line breeding, etc. They vary between breeding lines and breeders give them other fanciful names depending on color, etc.
I should know what 7 is, used to have them, can't think of the name at the moment (assuming it's not a hybrid, though it could be), not a peacock, a type of mbuna. 8 looks hybrid to me or possibly something line bred.