How do you make parts grow out of a character

Im making a game and I want to be able to make copies of a specific union I have slowly protrude from the player’s character and multiple limbs around their body (sorta like a few robio viruses out there). But i have no idea how to do this, nor how to attach the union to the players body. It would also be cooler if it came out at randomized points on the character, and if they all came out at varied speeds

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