User blog comment:Staw-Hat Luffy/Luffy wants the fruit WTF/@comment-251220-20130327131830/@comment-4605926-20130327181559

Mermaids are a species just like fishmen, longleg and longarm tribes. Different species are fine with me - Zombies are a result of a devil fruit, cyborgs are technology (half robot which I considered acceptable if you refer to my last, last comment), dragons are artificial beings created by Vegapunk. About the fairies, well I don't have a solid opinion about them yet as I haven't really seen much of them. Will be built in due time.

In other words, if it's science based (dragons, cyborgs etc.) or DF based (zombies, [centaurs, satyrs, harpies - Law]) then it's acceptable in my perception. Otherwise, unless I receive an adequate enough answer, my brain goes hurty hurty (I like the sound of that XD).