How do I make an enemy in my 3D first person maze game that is like the entity from imscared?

I already drew the entity it just keeps sticking in the floor and I don’t know how to fix it.

The examples include creating a 3D box. The sprite will be placed on these boxes with all sorts of details if you have a 2D drawing. If it’s a 3d object then you just need to adjust the x,y,z coordinates