No-Clip Player
From Treasure Adventure Game Wiki
No-Clip Player is a weird character that appears to have been leftover from development versions of the game. He looks like the player, however, he can go through walls and fly. He can be controlled with the arrow keys.
So far, he has only been found in the library in the City of Danausel. There, he spawns offscreen. To see him, you must hold UP for about 2 seconds, and LEFT for about 12 seconds, to move him onto the screen.