"Yeah, that's what I wondered, too. I was asking him how he got here, and he said he was playing on his Nintendo Wii before he got warped here," explained the princess.
"But how do you think we can get him to normal size, and most importantly, back to Earth?" one of the Toads asked. You were about to tell them that you saw a painting of your room and that you could jump on it, but you were interrupted by the other Toad.
"Maybe Professor E. Gadd knows! He's on the castle laborotories right now," said one of the Toads.
"Um..." you spoke up, to get the others' attention. "While I think E. Gadd can fidugre out why I got here, I don't think he may be able to get me back to normal size. Besides, there is a painting of my room past that hall. I can just go through it like in Super Mario 64 and I'll be home," you said. But Peach then shook her head no.
"Sorry, little guy, but when Mario got the 120 Power Stars and defeated Bowser to rescue me then, the power of the stars sealed away the ability to go through paintings, so it won't be that easy," she said, causing you to sigh in dejection.
"Princess, wasn't Starlow comming here again to discuss about a certain matter of converting the old Fawful Express tracks into routes for shipping products towards other kingdoms by train? We could ask her if she could try to help the shrunken gentleman," noted Toadsworth.
"Yes, I believe she and another representative of the Star Sprites were comming here, though it will take some time until they arrive," replied Princess Peach. She lifted you up for you to face her. "Well, would you want to spend the time with the Professor to see if he can help you in the meantime, or..." she asked you.
Well, in one hand, being with Professor E. Gadd, while it might not help you grow to full size or get home, but at least it might reveal some points, such as how you got here in first place, though it might not be a safe experience. Hanging with the Princess and the others is safer and may even give you a chance to meet the Mario Bros., but it might be actually kind of boring. Well, what will it be?