@ponx:
Baracuda type-fishman. I've said it before and I'll state the reason again. Mermaid is stated as the fastest swimmer right? If Oda follows real life facts (like he often does), then a Barracuda fish is the fastest swimmer, so in terms of speed its actually Barracuda > Mermaid > Flying Fish
I'm pretty sure the fastest fish is the sailfish. Barracudas are pretty awesome though, and he or she might have something in common with Nami since barracudas are attracted to shiny things.
@Noqanky:
I would actually love it if Oda trolled everyone by having no one join the crew at Fishman Island (a la Skypeia), and then have a fishman/mermaid join later in the series.
I can actually see this happening. I hope it doesn't simply because of all the FI hype and well, the sooner the better lol.
@Noqanky:
As for which type of fishman, I would actually enjoy either a fishwoman or a mermaid. The crew does need more interesting interactions between the girls. Hopefully this fishwoman/mermaid also has a melee-type skill and wanting to be the strongest at something (fishman karate?), which would also be an interesting interaction with Zoro who'd have the memory of Kuina and would lecture her on how her sex shouldn't matter.
I'd be sooo disappointed if it was a mermaid joining. After how fishmen and all the racism against them, slavery and Fisher Tiger + Sunny Pirates - themes that have been brought up over and over and over again, not to mention Nami's previous issues with Arlong, a mermaid joining would just be too easy. And I don't want to go through the last three arcs where it was a theme + Fishman Island, only for fishmen to go back to being villains' lackeys.
Whether the fishman will be male or female doesn't bother me. I have a feeling it'll be male simply because we've only seen one fishwoman and that was just in a cover story. It could go either way though. I have a feeling he or she will contrast Arlong a lot - probably being very nice, calm and sensitive.
Then again, Oda did say the SHs would sail away with a former boss character, which could be the villain of the FI arc.
@Noqanky:
I also always felt like the thing about mermaids being the fastest in the sea is a subtle hint for future usefulness of a mermaid (such as saving sinking DF users the fastest, for example.)
True, but you could say the same about fishmen having ten times the strength of humans, and ten times that underwater. Mermaids may be faster, but I'm sure fishmen are better at combat.