In Attack on Titan, it is revealed at the ending of the anime/midpoint of the manga that the walls surrounding their City in a Bottle are actually living creatures. As in, the walls are made of Colossal Titans' hardened Instant Armor... with the aforementioned titans inside the walls as foundations.
In an episode of the anime adaptation of Kaiketsu Zorori, a Nurikabe is recruited by Zorori to be a part of a soccer team, as a goalie. Being a literal wall that is as wide as the goal itself, the youkai provides an unfair advantage for Zorori in the corresponding soccer match.
In One Piece, one of Gekko Moriah's zombies is a wall zombie, a literal wall with a human face stretched out and stitched on. It doesn't do much except appear and block an entrance some of the Straw Hats were going to use to escape from other zombies.
In The Great Yokai War, one of the Youkai featured is a talking, limbed wall. Just picture an extremely wide SpongeBob SquarePants with a disproportionately huge body. Guy's just a literal Living Prop though, and does nothing much in the story other than being literally part of the background.
The movie Labyrinth features a number of creatures that are basically part of the architecture of the eponymous maze. These include the talking door knockers, and the talking walls which give false alarms to passersby.
In the Discworld, Unseen University is explicitly described as a building complex that throughout its thousand year history has absorbed so much ambient magic that it is practically a living thing with emotions and a degree of sentience. Equal Rites has the witch Granny Weatherwax reaching out her mind and effectively borrowing it - ie, a sort of benign possession which a witch may only do with the mind of a living thing. She reads its mind and discovers it is frightened and fearful. Much the same happens in Sourcery, when the University dimly senses big trouble ahead, and doesn't like it.
The Malus from the Doctor Who serial The Awakening was a monster lying dormant within an old church wall until it awakened to wreak havoc on Little Hodcombe.
A demon who's also a wall, which inspires worshipers to fight over it, shows up in a second-season episode of Angel.
In one episode of the Mighty Morphin' Power Rangers, Rita accidentally brings a brick wall to life. Brick Bully is literally a brick wall with an Upside Down Face, limbs, and various graffiti all over him. He can turn others into bricks and when he eats more bricks, he assumes a slightly more humanoid and mobile form.
A rather well renowned youkai from Japanese folklore called a Nurikabe is an animated wall that impedes travelers. It is the basis for many characters such as the Whomps from Super Mario Bros. and the Monol monsters from Monster Rancher. Interesting enough, it's common depiction of being an animated wall is somewhat of a modern representation. Originally during the Edo period, one of it's early depictions was that of a three-eyed grotesque vaguely dog-like creature. Over time, it's depiction changed to a literal wall with limbs and very vague features.
Another youkai is the Mokumoku-ren which is a monster created from shoji, the paper sliding doors and windows found in Japan houses. When shoji are not taken care of, they can become riddled with holes. If not repaired for a long time, these can become infested with eyes. The Mokumoku-ren is generally creepy but relatively harmless. It is however usually a sign of a greater infestation of youkai in a household.
The Living Wall, which gains power by assimilating nearby corpses.
Second edition had the "Greater Mimic". A larger version of the game's resident Chest Monster which could impersonate rooms or other structures.
First Edition had the "Lurker Above" (just called the Lurker in Advanced D&D), which resembled the ceiling.
Its counterpart, the Lurker (renamed the Trapper when the LA had the "above" dropped) disguised itself as the floor.
The Dread Gazebo is an accidental version of this which came about when a player assumed a "gazebo" the Dungeon Master described was some sort of monster. Fed up with his insistence on attacking it, the DM decided it pounced and killed his character. Read the original story here.
Secret of Mana has two different Wall Face bosses, both that function similarly. They have a central third eye weak point that has to be defeated to win, and try to crush the player if both of their normal eyes are killed first.
Blockhead of Ōkami is a youkai based on Nurikabe from Japanese folklore. They appear in several places during the game, always blocking the player's path with their wall-like body. To get past a Blockhead the player must headbutt him to make him reveal his weak points, memorize them, and attack them with his Celestial Brush, after which the Blockhead disappears in a puff of smoke.
Ga-ha! I am Blockhead! I guard this place so that all shall pass! Er, wait... I mean, none shall pass!
Nest type enemy fused to a variety of walls/bulkheads throughout all 3 Dead Space games. They spawn nasty babies with missile shooting tails. They cannot be rerouted around and the babies Will kill you if they manage to shoot you enough times.
The doors to a boss room in SuperMetroid and Metroid Fusion are covered by giant eyes that shoot eyebeams at the player and must be destroyed before you can enter the room.
Several The Legend of Zelda games contain enemies called Flying Tiles. From a distance they're just ordinary floor tiles, but as you approach they levitate up, start spinning, then hurl themselves at you.
Five hats means that five tropers think it is ready to publish.
You are saying that you think this draft is ready to be published. That means the description is not ambiguous,
it doesn't duplicate an existing trope, there are at least three examples, and the title makes sense.
Is that what you meant to do?
You are saying this draft has a ready-to-publish hat it does not deserve and you are taking it back.