LeonardoThe brothers thought that you were crazy from the very moment they met you. Who would talk about Superman and UFOs when they had nearly been attacked by a group of men? Mikey, of course, but no one else would possibly think like that.
Leonardo thought you were very smart, but he also knew you were very hyper, which happened to take a toll on your thinking before acting. This is why whenever you came to the lair, everything that contained sugar or caffeine was well out of your sights.
Master Splinter enjoyed your liveliness. It was great o have another optimistic soul in the home rather than just Mikey. Not only did the boys have a good friend, Mikey had gained someone who he could spend his time with rather than just a TV screen. He was greatly happy that Leo had taken a liking to someone like you, too, rather than someone who would end up hurting him.
Raphael
To be honest, all of the boys liked you, even Splinter. He was surprised that Raphael had been the one to bring you home and not Donatello, but he was happy nonetheless. You were going to be good for him, even though fragile, you were fierce and had spirit. Another good reason is that you were reclused, but also caring. You looked out for the brothers at a distance, they just didn't know it yet.
Michelangelo
They took only a little bit to adjust to you. Everyone liked you, even Raph. Mature yet naive and innocent, they vowed to watch out for you and allow you to learn. They were your teachers, and your best friends. Something that you really didn't have up on the city surface. You were beyond thankful that they came into your life, and they were thankful that you had come into theirs as well.
Donatello
They knew you were trouble from the get-go. You were mean, impatient, quiet, and at the same time you were smart-mouthed. They had a feeling that you stole, they knew that you fought, and they knew you had a things for trouble and violence. Foul mouthed and stubborn, the boys were wary of you at first. Yet you connected with them all, and they began to second guess their first opinions.
From the moment Splinter had seen you, he knew that you had a heart of gold... you would just have to allow it to show.