For cases like post #4982856.
The shoulder carry wiki states that the tag is only for people, but the on shoulder wiki also states that it can be used for characters or creatures sitting on another's shoulders.
We can either imply on shoulder to shoulder carry or make on shoulder only for creatures.
I wanted to create some utility aliases for these tags but I thought a discussion should come first.
There's also confusion between sitting on shoulder and shoulder carry. A potential solution for this is to name the latter sitting on shoulders.
Updated