the true good crews are: rocks pirates, shp, bbp, rhp, bmp, beast pirates, roger pirates and doquixote pirates
Arlong Pirates, Baroque Works and Thriller Bark Pirates too. Basically the ones who had importance to the plot...
😂

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What are some examples of pirate captain character who are likeable or interesting enough but whose crews are really lackluster and bland, being either too generic in appearance or very underdevelopped in terms of characterization and personalities ?
I'd say that all of the Supernova crews qualify. They cruelly lack personalities and real characterization or memorable design, aside from a few individuals such as Bepo, Heat and Wire whose personalities aren't even that developed or memorable either.
I'd say the first antagonist crews that appeared in the series. For example, the Buggy Pirates and the Black Cat Pirates (Captain Kuro's crew). The Krieg Pirates have an interesting crewmember (Gin), but it's still lackluster.
Obviously, as I said above, I'm talking about relevant crews to the story arcs. Every crew not related to the main plot (e.g.: cover story crews, Supernova crews, etc.) is bland, this is how much Oda cares about the side characters.
The Firetank Pirates are a good example on how relevance can make a crew better. In Sabaody, Vito and Gotti are nowhere to be seen, but in WCI they were introduced to lift up Bege's uninspiring crew. However, it didn't happen with the Heart Pirates and the Kid Pirates in Wano, so Oda might just not care about most of the Supernova crews (he even got rid of Drake's, Hawkins' and Apoo's crews
😂)...