underfoot

A smaller (generally micro) character physically underneath a much larger (generally macro) character's foot. The character can be any distance from the foot as long as they are underneath it.

For character's with similar proportions, the stepped on tag, along with the relevant foot_on_x tags is more appropriate.

Not to be confused with

soles / underhoof / underpaw - These tags are used to refer to visible areas under the foot / hand equivalents. One of these tags is usually applicable in underfoot scenarios.