Still trucking through the Fiend Folio and redecorating...
A Kamadan is what you get when you take a displacer beast and you replace the panther part with a leopard and the tentacles with some snakes. Why would you do that? Why would anyone do that? Just be impressed with yourself that you got an idea as harebrained as a tentacled puma with built-in stealth technology to actually kind of work and move on, crazy lily-gilding geneticist/wizards.
So, anyway I took the snake thing and leopard thing and did this...
...which I like a lot but really this is just another one of those lazy, heart-of-darkness-dwelling creepy-wisdom-dispensing you-come-to-me Colonel-Kurtz monsters because seriously no way is that thing chasing anybody except maybe in some Mayan carving and/or DMT trip.
Kelpie is a dumb name for anything that isn't a Korean novelty dessert but the basic idea of some creepy seaweed-maiden that goes all hagged and horrid and Room-237-scene-from-the-Shining on you is fine.
Kenku: a bird guy. I have already cracked wise on the Friar Tuck budgie-man Kenku in the Folio. He is hereby replaced. What is scary about birds is the clockwork vapidity of their eyes. Give the bird personality--as they did in the original picture--and it all goes awry.
The Khargra (a kind of fish/xorn from the Earth Elemental dimension) is a monster that I have never ever heard anybody talk about ever, despite the fact that it has a pleasingly freakshow picture......and is just weirdstupid enough that someone, somewhere might actually take a shine to it. That someone is not me. Much as I would like to see it fight a sharkticon, a fish that flies or tunnels (I refuse to look it up) through walls is just not what I need in my D&D game. I have decided Khargra is instead a weird Xorn god that is sort of, to the Xorn, what Charon is to us, and sort of greets them or otherwise facilitates their visits to our Prime Material Plane. Because I do need that. I guess. Hey, I said I was going to do every monster, right?
The Kilmoulis is the Fiend Folio's dumb elephant-nosed version of a species of Irish or Scottish or English brownie or fairy or whatever that--hey guess what?-is mischievous and/or sometimes helpful. The only thing that really distinguishes it from the entire rest of the Midsummer Nights Dream posse is it hangs out in mills. Which, as monster-distinguishing-characteristics goes, is not exactly up there on the excite-o-meter with snakes-for-hair. This sort of thing is all fine and good if you're thinking up tonguetwisty names of things to keep kids from tromping the dales or romping off the ockle or whatever it is bad children do on the other side of the Atlantic but if I'm going to give something stats I need to have something more to go on.
So anyway, this is Kilmoulis. He appears one morning where one of your thumbs should be and does his evil bad-fairy stuff from there.
Kuo-Toa: Yeah yeah, I know "Shadow Over Innsmouth", Module D2, blah blah I hate them anyway on account of they look like footballs with fins in diapers. Fuck them. Lovecraft's Deep Ones were disturbing because they were genetically mixed in with regular people and that was gross but these guys are just one more grunty humanoid race. Plus they wear sandals, which is entirely unacceptable.
Basically when I need bipedial icthyoids, I'm going to use the fishwife. Illustrated below is the fishgroom, which is what you become if you marry one.