The Colossal Titan Size theory:
From what I can tell the Colossal Titan(CT) like all Human-Titans transform into Titan mode, but he seems to disappear after he has completed his objective. This is where my theory starts. Originally I believed that the Colossal Titan could teleport from one location to the next without problem, but I have realized that it is next to impossible with little evidence supporting it. Interestingly enough, during the second appearance of the Colossal Titan (during the attack on Wall Rose) Eren ended up getting a direct hit on the "Titan Kill zone", but instead of dying the Colossal Titan simply released a huge amount of steam. From this information I realized that what if the Colossal Titan's special ability wasn't its gigantic size, but it could actually change its size instead.
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| The steam coming out of the Colossal Titan |
If this is in-fact the case than the Colossal Titan could actually be full of hot air instead of flesh and bone, if the Colossal Titan originally started out as a regular Human-Titan than the Colossal Titan would have to collect a huge amount of oxygen and heat it up with its body (Titan body temperatures are very high). This could also be the reason why the Colossal Titan does not have any skin on its body, when the Colossal Titan increases its size than the skin would stretch, but skin can only stretch so much before it breaks. If the Colossal Titan started out 15m tall (same height as a two story building) and grew in size to over 50m (the size of the wall), than the skin would have to stretch over 40m or 3 times its original size, if the Colossal Titan's skin does not snap than the skin would become so thin that it could become see through (i.e. you can see the Colossal Titan's muscle and bones). This theory would also help counter the square-cube law (which measures the amount of force required to perform an action), since in both appearances of the Colossal Titan he was taller than the walls itself meaning that the Colossal Titan is over 50m; which means that without crazy enhancements to the Colossal Titan's body itself than it would end up breaking its legs almost every step and eventually implode on itself.
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| Square Cube Law |
The hot air/steam that is inside the Colossal Titan would help the Colossal Titan maintain its form and also give extra support to the body itself, much like a hot air balloon. Due to internal heat the molecules inside the Titan's body would try to get as far away from each other and increase the amount of pressure inside the Colossal Titan's body, the increase of pressure (if high enough) could make the Colossal Titan explode and release the pressure inside its body, creating a huge blood splotch on the wall. If both the force of the Titan's implosion and the Titan's built up pressure than the two forces would cancel each other out unless a third force gets involved, this is due to Newton' law of motion.
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| Newton's First Law of Motion |
In the end the most logical power that the Colossal Titan could have would be the ability to change his size (would this be called shape shifting?), I may be missing a few factors in this new theory but so far it seems pretty reasonable to me and would explain why the Colossal Titan doesn't implode on itself every time it kicks the wall.
