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Toons look very different from us, they have fewer details and are much more obnoxiously colored. Their body is composed of a substance that's both malleable like clay and sleek like rubber and empty space where gasses or liquids can fill. Rarely they wear a full coat of fur that's very soft and fluffy.
Note that based on which species they are, they may have a slightly different anatomy like claws and fangs made of said substance if they are a feline.
However, all toons always have a complete lack of organs, bones and muscles, instead food is stored in their mass and converted into the same substance. This process is not well-understood in their world because it defies logic, like most other things over there actually.
This brings in new advantages not seen in our lives like a good resistance to trauma. Blowing toons into balloons, crushing them or burning them to a crispy pile of ashes doesn't damage them like it would for us. At worst they may feel a light tiredness or headache after the effort.
Despite not having proper nerves. Toons still have some sort of pain receptors. These work differently for them compared to us, while they can feel temperature differences like warmth and cold or painful stinging feeling, they can't suffer the martyr. All forms of pain to a toon is fleeting, if you cut a toon in half he'll feel the cut, but afterward they won't feel anything else.
I am not really liking the idea of cartoon characters being exactly like us. So, while most artists draw child characters as children with proportions corresponding to ours, I am more interested to draw younger toons vastly differently. Hence this is the lifecycle of cartoon characters within my lore. You are free to adapt or use my infopage for your own needs.
It's never been proven if toons came from eggs because they are always found outside them. Some folktales say that a magic stork lay eggs that it intends of bringing to parents once they crack open, but the stork is so clumsy the baby is dropped somewhere on its way. This would explain why babies can be found, but no eggs or eggshells.
During their larval stage, baby toons are just a blob with sometimes a tail trailing behind after a couple weeks. They move by hopping. They are nonverbal, but can be taught to speak. Due to the way toons aare born, they have no biological parents and are taken-in by other adult toons as pets (not the kinky kind, just like an animal)
A graph or chart will be supplied someday, but for now if you can't picture what they'd look like, use this as reference Baby I - Wikimon.net
During their waddling head stage, toddler toons grow a pair of feet, so they no longer have the need to hop around it's much more convenient! More rarely, they grow hands, but usually not. If they do they're usually stubs which makes holding items harder anyway. They are capable of speech, but it's limited and several of them would remain nonverbal until their next stage.
If you can't picture what they'd look like, use this as reference Species: waddling head - e621.net
By this point all of them are capable of coherent speech whether they were taught or they learned it on their own. They have hands and feet, but also legs, arms, a belly and a torso growing under their head. It's all very thin and brittle-looking like a stickman, but as the final stage before adulthood, these parts will grow thicker and longer.
I think it's clear to everyone what I meant by 'chibi', but here's a refernce just in case chibi - e621.net
The toon is now fully anthropomorphic with clearly-defined proportions comparable to a real adult from the human world.
If a toon gets injured causing a loss in their mass (since theyre all made of a substance) or getts changed by magic or latex goo, their body will regress into a dwarf, a smaller version of themselves with proportions akin to a human child. Mentally, they are still adults. Some toons are naturally this short, but it depends heavily on their animal species.