A tool in the least useful senses of the word: Armed U.S. protesters enter Michigan capitol to demand lockdown end – Japan Today:
A person used as an instrument by another person; – a word of reproach; as, men of intrigue have their tools, by whose agency they accomplish their purposes.
I was not made for a minion or a tool
Also, an obscene terms for penis; – a stupid, irritating, or contemptible man.
That guy is such a tool.