Well, that is quite the question
All LoveDolls (blue mice, purple bears, and humans in suits not withstanding) are around the same height of around 11-12 feet tall. Jerri is roughly 6-foot. Teddibear is marginally taller than the rest standing at about 13-15 feet tall (around the same height as a Rogal Dorn heavy tank, just in case the Imperium finally listens to my radio calls and squishes Impuro). And as for Creepi... It's complicated, one thing you'd learn fairly quickly when actually analyzing the Gremlin-verse is how nothing makes sense and that only consistent thing is its inconsistency. In one image I tried using Caitlyn as a base-average height for the Impurified, but in another image she's shorter. I'm single-handedly keeping Tylenol in business with how many headaches this caused me.
ANYWAYS! As for their weight, it's a lot more simple to calculate, Jerri ways the same as the average adult man (190 lbs), as for Teddi-n-the bunch, I decided to go with the rather conservative estimate of 1000+ lbs (notice how Teddi is twice Jerri's height yet her weight is more than twice? That's because of something something, square cube law. Realistically, everyone except for Jerri would collapse under their own weight and would be entirely immobile for long periods of time. If you ever get in a fight with Teddibear, just poke her in the legs with a stick and she'll be stuck on the floor for the next 3-5 hours.)
How did I get these numbers? Math, lots of math. I'm one of those weirdos who likes math. DON'T JUDGE ME!
As for the second question, I must say that LoveDolls/Cryptids/Impure Creatures/Hood-Gals are a mix of all three, paranormal, technological, and biological. All four types are made entirely of Impuro's energy, an inherently paranormal substance that I suspect requires nutrients to survive like human cells (In one image Bratti can be seen eating a popsicle, indirectly implying that they need sustenance, like food and water, to survive. Not to mention (as you said earlier) they can drool, adding to the idea that they have a digestive system. Impure Creatures specifically digest sperm for nutrients (sperm barely has any, by the way. Might I suggest blood? For efficiency's sake?) in order to reproduce asexually (They bud off a parent, by a textbook definition, they reproduce asexually). The Technological claim might be a bit of reach, even by my standards, but hear me out. Security has a light-bulb on the top of her large forehead, and, in a singular image, it lights up when exited. This implies that Impure energy is able to both interface with technology, and transmit/receive electrical signals like a human neuron, albeit heavily amplified to allow for enough voltage to power the bulb in the first place.
Decided to split this up into a separate paragraphs, here is when I enter my mad-scientist arc.
Technically, with Impure energy being technological, this means someone, anyone, can purchase a doll only to experiment on them for the greater good. I could throw one into a blender, and then turn the stringy fibers that come out of it into thread, then weave that thread to form a new, better electrical system, a system cheaper than copper, a system that can withstand higher voltages without blowing up. What if I go further, as every good dictator knows, the moment something new pops up, the first thing you have to do is weaponize it. I could kidnap one singular Impure creature and then place them in a cage, sacrifice someone to it and now I have two creatures. I then take the "child" and give it a controlled shock to wipe it clean. Since the LoveDoll manufacturing process involves imprinting a new personality, likes, and dislikes onto a fresh canvas, I say we copy that, imprint our own programming onto our new war-bots, a programming severed from Impuro's grasp, a programming loyal to the dictator and their republic. Chop off those useless stubs they call "hands" and replace them with new ones, ones capable of gripping a weapon. We cover the thing a new metallic shell capable of deflecting small arms fire. If your budget is adequate, we can even attach radios to them, allowing them to coordinate strikes, pushes, and retreats at scales previously thought infeasible. Since we only need one creature to create thousands, that means we can have a theoretically infinite armada of war-bots ready to serve under our new empire. From here we can either sell these bots and become rich, or we can use them for ourselves, taking over country after country until Impuro herself is trembling under our imperial might!
Phew! That was a mouthful. I cannot answer on personalities though, I'm bad at analyzing that.
EDIT: Fixed the numbers
EDIT 2: As for your 3rd question... Do you even know what you're talking about? LoveDolls are creations of Impuro, a god responsible for literal fucking genocide, call me doll-ist all you want, but I think there isn't a singular wholesome bone in their body.

