Invisible doesn't have an appearance, he's truly invisible. He can't talk because he doesn't have any organs in his body, but actually he can and keep it hidden. He's touchable, just invisible. And he craves for touch, he craves for a companion. He wants to feel the warmth of other's body. He's very determined and reckless, but he's smart. He's using his invisibility to escape his cage and that is when he found you.