MUST READ !!
I think Big Mom implied that Third Race doesn't exist anymore
So far we have seen:
Fishmen/Merfolk - Giants - Longlimbs (Arms - Legs - Necks) - Minks - Three-Eyed - Dwarves - Lunarians
Oda made sure to show us Presence of Fishmen/Merfolk, Longlimbs Tribes, Minks, Three-Eyed Tribe & also Dwarves in Totto Land
And also confirmed that Giants & Lunarians are missing (First one due to Big Mom Hatred & Second due to King being Sole Survivor)
I believe Oni, Yetis, Ancient Giants ... etc are all Variations of Giants
Just like Longlegs, Longarms & Snakenecks being Similar (Tribe with Long Body Parts)
I also believe that Sky People (Skypieans, Birkans & Shandians) are not a Separate Race, they are simply Humans
That's why they aren't present in Totto Land & Big Mom didn't mention them
Cuz they are similar to Kuja, just Human Tribes
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I think that by analyzing how Oda created those Seven Major Races, we can figure out Nature of 8th One
I think we can Split these Races into Two Groups, those who resemble Humans most with only Single Difference
And those who represent Hybrid of Humans & other Creatures
First Category include Giants, Dwarves, Longlimbs & Three-Eyed Tribe who simply represent Oversized Humans, Small Humans, Partially Oversized Humans & Humans with One Additional Eye respectively. So here we have Four
Second Category include Fishmen, Minks & Lunarians who simply represent Human/Fish Hybrid, Human/Fur-Mammals Hybrid & Humans/Birds Hybrid respectively. So here we have Three
It seems that Second Category is missing One Race & it can be noticed by comparing the other Three:
Fishmen represent Water/Sea, Minks represent Lightning/Forest, Lunarians represent Fire/Sky
So looks like we are missing Fourth Race who should Represent a Hybrid between Humans & certain Creatures, who have Elemental Powers different than Water, Lightning & Fire, and also should belong to Land since Sea, Sky & Forest are already taken
(This can be noticed in Noland's Flashback when before they were going to Sacrifice Calgara's Daughter, they called for God of Sun, God of Rain, God of Forest & God of Earth !!)
It's getting clear now that Final Race = Hybrid of Humans & Earth Creatures (Non-Fur) + Have Powers similar to Pica
There is only One Animal that fits this Description & was mentioned countless times throughout Story & that is "Snake" !!
But could also mean "Dragon"
Final Race are basically Hybrids of Humans & Snake/Lizards/Dragons
They are the Race that completely disappeared from Existence but holds the Key to All World Secrets
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I will hopefully share a Very Detailed Explanation of everything that was mentioned here in my Upcoming Analysis