Jolin Nicmebo, 14, daughter of two scientists. (Her parents have heard of the discovery of the Transformation Parasite but are unaware about the disaster that followed)
Jolin was sleeping soundly in her room when a small TFP snuck into her apartment. It made a quick entry into her body through the skin (specifically at the shoulder). Later she would jolt awake from a burning pain in her tummy. She also seemed to hear a voice in her mind.
"Multiply" & "Breed" were the keywords she heard from the voice, then it came to her knowledge that a parasite was inside her. She then had the idea to let the parasite replicate and collect all sorts of DNA. With that, the burning sensation in her tummy subsided.
Since her TFP was currently very short and therefore quite weak, the only way for it to get out of her body was via regurgitation. So she grabbed a jar and puked the parasite into it. As days passed, dozens of the TFP appeared in the jar averaging in length of about 9 inches. One day Jolin opened the jar & the parasites, remembering her will, left her home to explore the world for samples.