Have you ever known someone who regularly borrowed your personality?

I think it’s pretty normal to mimic or copy people that we like to some degree, we learn from others and are social animals and so everyone does this a little bit. But have you ever known people who seem to take entire parts of your personality or copy things you like to a degree that it feels invasive? What about your problems? Have you ever had someone who feels the need to always have the same problems as you even when they dont? Of course they say that imitation is flattery, but can it feel violating to have someone copy you too much? Has it ever happened to you and how did it feel?