he's a tool
Someone who doesn't have their own identity but will latch onto others ideas to be popular. He will others use him. Used in a sentence "He's such a tool" means he is inauthentic and just mirroring beliefs and actions of others.
He's a tool, he can't think for himself.
He's a tool
An individual with zero common sense or logic and tries too hard to fit in. He or she could be referred to a pathetic loser or no life individual. Person could also be called the word sanjive.
"Oh look at that person trying to live off others idea. He's a tool."
"See how fake and plagiarized that individual is, he is such a sanjive."
"See how fake and plagiarized that individual is, he is such a sanjive."