What is the most unrealistic unit?

What is the most unrealistic unit? (Note this is just for fun discussion and I'm not advocating any changes..)

I was thinking any throwing units (skirmishers, axe throwing infantry) due to the sheer quantity of heavy throwables they go through and any gunpowder units due to reload time of the era.

I'm also considering the scorpion when used on a mobile capacity and maybe fire ships. ,