These are all great questions, and in trying to answer them I think I've found I only want to do that via drawings. All the categorisation in biology I think is why I get bored of reading about it so quick, and being visual-only allows for me to hide my ineptitude and be more suggestive. I'll use these questions as prompts when I next get the itch to draw more gegeckers!
I was imagining they'd have a frog-ish feel, but would react to pets with octopus-like papillae that makes it less slimy and more scritchy.
And, Of course, use the gegeckers! The more chances I get to see them the better!
And yeah, humans for intended scale (though I would love to see one big enough to level a city):






Why is that? For the snazzy glasses? Whenever it comes to character creation in a video game I almost always make a ponytail dude - I like to see how the game handles the physics of it.