Mike raised an eyebrow. "You're a pirate?" Then, he leaned closer, eyes narrowing dangerously. "Well, I'm a ninja, and where I'm from, we're supposed to be mortal enemies."

Then, he promptly straightened and starting rinsing out his hair, not looking directly at Guybrush (what that his name, seriously?) as he worked to keep his face and voice blank as usual. "But I really don't care about that. Name's Mike, and I'm a ninja. We stick to land and fight from the shadows. Shadow warriors."

He wasn't up to really giving his full name to strangers. At first, he had, but then he decided to be more cautious as the military took over. They were plenty more dangerous than the Doctor had been, and that put Mike on edge enough to hold information back. Even if he was already dead, he didn't want to risk getting himself killed again.