Thoughts!
First off: Fantastic, ridiculous, if I can concoct stuff at this level of quality some day, I'll die happy.
Second: For your Gorilla... if the function defines the form, then what is his body armour/cyborg-ness doing? What is he supposed to be doing?
The rest of your work seems to make sense in this regard. Not much seems incongruous; everything is where it should be, reads easily, and supports a function.
For example, the Deathbot. From a few seconds of looking, my brain picks it up as a tough, frontal-defense robot, built primarily to stand its ground and repel a number of medium-to-small, relatively slow targets. This idea of the robot is gathered from the way it appears to be crafted. It has a single, nonrotational optic up front, mounted low and moderately well defended, as well as two frontward-facing guns, seemingly well-protected legs and an energy core placed behind it all where it's very unlikely to be hit at all. Your design of the character is fantastic, and tells the viewer a lot of things that probably won't even register unless he thinks about it.
In comparison and using the same analysis, I wanna look at your Gorilla. It has a giant friggin' cannon, which is very clear in intent and purpose. It appears to be built to charge headlong into a battle and exploderize everything by virtue of the fact that its gun is so large aiming is just a suggestion, not a necessity. It is incongruous, however with itself and its own percieved function by the way it is crafted. If it IS a beast (Cyborg primate whatever) meant primarily to juggernaut its way in there and leave bits of robot strewn across the earth, then why are its two most important physical forces entirely unarmoured, save for two bracelets that remind me more of restraining devices than anything else? Also, why is there more protection on the rear end, where nothing is likely to even be scratched, let alone permanently damaged?
The character's design isn't telling me what it's meant for. My heart says it's made to rush in there fastlike and crushinate (Also, I feel like I read this somewhere), but the character design isn't supporting that thesis, or offering another suggestion (If the gun had a longer barrel, and the gorilla had freaky optics, I'd think sniper gorilla. If it was clutching a nuclear warhead, I'd think kamikaze gorilla.).
What I'd be playing around with or attempting to do would be to push the idea that this gorilla does not believe that "slow", "backwards" and "stop" are anywhere in the dictionary, and that forward progress despite any obstacle is the only way to go, ever. The character doesn't project any definite idea right now, and I think that's where it suffers most.