These are just based on the scrapped races. With other words most of them didn't had generic human like body shapes instead each had respective shapes. That is how penguins look like penguins, bears look like animorphic bears and the list goes on. You get the idea. These are just mods someone made generic as possible so they can recycle the already existing clothing items instead of making too many custom things, nothing more. Honestly some of these look awful and glad they are not in the game in such shape and form however would like to see them in their respective forms and originally intended because the game is lacking tons of things that had been removed and promised so as there are tons of possibilities etc. Some of these we have costumes and NPC of so you can RP it tho so as mod to play as (penguins etc). I also agree with some of the things Moor mentioned. The bioms do fit well. And Rabbits as much as weird to live in a desert among rainbow aliens isn't that far off because the rabbit statues are in desert (and jungle too) tombs. Meaning they been a part of the such society. The rainbow folks actually had unique dialog even tho some had on rare occasions hylotl and apex dialog so as human too not sure why. "I once had a family that looked just like you" said to the human is something no one else ever said. Also the bone folks would live in bone bioms and even among the other zombies that the apex made as their well known experiments etc.