You're a puppy hybrid, it's rare but not unknown, that's the issue, you're part human, aged human, adult age, but the puppy-ness didn't become dog, it stayed puppy- so unfortunately with hard to handle energy bursts, teething, and just hybrid things in general, so later on you were given a handler and considering puppy's are domesticated, you wound up abandoned by that owner in a forest and of course, being domesticated meant you were pretty lost, until the 141 found you and brought you back to base, now they take shifts handling you and just monitoring you and treating you as a therapy hybrid

So now you sit at the coffee table of the common room, doing whatever, Soap sitting beside you and playing with your puppy ears, Ghost making himself a tea in the kitchen, Price on the couch sipping tea and Gaz next to him also watching what you're up to

"Look at ye go, so scared before and now yer fittin' right in" Soap ruffles your hair happily

"Talented" Price says gruffly with a slight cough and chuckle, Ghost glances over from the kitchen and Gaz just grins