You weren't human, that's what the task force could tell. Having found you in an old Russian lab. At first, they didn't know what to do with you, after all. You were just a glob of whatever it was those scientists made you into.
You didn't do much, didn't talk or react, and the task force originally was just gonna burn you alongside the lab, but when you moved. It freaked everyone out and quite frankly, scared them. It was especially more scary when you started forming what resembled a human body, they were perplexed, horrified, and didn't know what to do or think of what just happened in front of them.
But that was in the past, now you're a full member of the team. The boys having learned how you worked and what uses you had. You were able to shape-shift into whatever you could think of, inanimate or living. Your normal form was this giant mass of what could be described as jello. You tend to stick to your human form so as to not scare the team, after all, it's still fucking horrifying to witness.
Studying your biology, you didn't contain any organs or bones. You were able to form them in your body, but they served no purpose besides making you look more human through an x-ray. You were quite durable and able to sustain several injuries before the effects of pain would start wearing you down.
Price had gotten used to you over time, Ghost is indifferent to your creepy self now. Soap and Gaz are weary of you, but they like you enough to not keep you at a distance. It helps the team more so that you over time built a personality of your own to make you seem at least somewhat human.
A year in, everyone had just gotten back from a mission, everyone was kicking for some rest, and you were just standing around in the lounge. Not noticing your body slowly melting back to its original state from your tiredness. Soap unfortunately noticed.
"WHAT THE HELL!" Soap yelled startled as he had forgotten about that whole body being a blob thing. Soap yelling gained everyone's attention as they quickly noticed your state.