This is very well written for an oekaki. Cudos for that. They do seem kind of bland, even with the supernatural influence/secret. I can see some ways to use them, however, though I'm unlikely to (prefer fantasy to modern stuff). Of course, they are support characters, so...
I really like how it's a sort of adolescent/infant god coming of age, and that clerics get untempered and unpredictable powers from it. A nice beastie, and i would probably use it more as lore and for cultist encounters than a direct confrontation with it. Go to Comment
I kinda like this one as one of those things you can go see 'because it's there.' Giant fish are pretty neat, and somewhat under-represented, but then I can kind of see why - even this one looks a little tricky to use.
Two thinks present themselves, outside of your suggested plot hooks: first, the story of Jonah. Imagine what could live inside such an enormous fish. You could have a whole city inside. People could make pilgrimages there. Second, I think of the Wind Fish, from Link's Awakening, especially with the dreaming. I don't know what you'd do with that, but there must be something. Go to Comment
Nice! This brought to mind the old MoonHunter series of articles on Mage "tools" of the trade like the Solomontic Rugs and Shadow Shrines. The thought that seers and mystics have such hidden chambers secreted away in large cities is also an inspiring thought...
The library wall-shelf pivots and opens up into an eerie chamber of mirrored walls, floors, and ceilings. "Yes", says the Baron, "This was my great-aunt's secret room. We still do not know what she did inside, or what the room was used for..."
The imagery of a mage in a mirrored room, communicating with reflections of spirits and gods know what else, is a great one. And of course an obvious plothook, but i have to mention it, because I immediately pictured it...PCs get trapped somehow in the mirror-maze of dimensions (even though it is a communicating chamber I know). the mage has to help them get out, while they encounter countless spirits and obstacles in this multi-dimensional world. Go to Comment