I can help with the obvious ones, though I noticed that recently a number of the ones that got through had remarkably realistic usernames (I suspect they may finally be doing what I would do, harvesting real usernames from membership lists).
If we're honest, it's not likely to cause a problem in a publicly-posted game because of the nature of memes' wide distribution and the difficulty of establishing authorship. But it's not something that OGA can host because it isn't technically eligible for FOSS licensing (one has to dot one's is and cross one's ts in this sort of situation). I'd suggest that you look into what cemkalyoncu is suggesting--I imagine that someone would probably be willing to draw up similar images which could be licensed appropriately.
Not meaning to be the bearer of bad news on that--we're always happy when someone is willing to share their hard work in this way, and it's always a bummer to have to point out if there is a technical problem like this.
"Its a meme really... so it must/should belong to the public domain."
Whether it should or not, that's not how the law works. For instance, the original artist of the trollface is actually known, and it doesn't matter how far and wide the image is spread, it's still his work. That's a kind of exceptional case but (with a few notable exceptions) they're all recent creations whose copyright isn't close to expired. Unlike a trademark, you don't have to defend your copyright to maintain it. Now whether it would be practical to collect damages is a different matter, but that doesn't make it legal. One might argue from a different angle that there isn't enough substance to qualify for copyright, but I doubt you'd get much traction on that front.
I am not a lawyer, but that's my understanding of it.
Gotta go fast!
"Will there be a green hill zone? I don't know. Will there be a red hill zone? Yes, there is."
Yeah, diagonals are a bit harder, and of course add a multiplier to the total number of frames you need. Some isometric sprites have enough perspective imprecision that they would probably work as diagonal movements in a normal RPG perspective world, but then you don't have front and side motion. Aside from that, I can't think of any in the archive.
Nice work. I like the design and execution both, and I appreciate your willingness to share her under such a permissive license.
For the record, you would never want a transparent gemstone that had been faceted so shallowly. When the facet angles in the pavilion (the bottom) are below the mineral's critical angle light just passes right through, leading to a "window" or "fisheye." Diamonds in particular are cut to pretty specific proportions to be sure that they have good light return. I'd recommend taking a look at some photos of faceted stones to get a better idea of their proportions--what you have is neat but not quite accurate.
You don't look the way I'd imagined you.
(Seriously, though, awesome work as usual. Inspirational stuff!)
"*Edit: Also, to me your goat looks like a man in a grass skirt brandishing a big knife, which is pretty badass. Kudos."
Remind me to add that to my RPG enemy set.