Shadowman

A friendly mob that exists as a shadow of the player, and appears mainly at midnight and in caves.
This mob is like an immortal that has no effect other than the effects of splash potions and residual potions.
Even if you defeat it, nothing will be dropped.
It also has the same transparent ability as Vex.
However, it is a mob with a very shy personality.
If you have any other good ideas, let us know in the comments.
Thank you for taking a look at my thoughts.