Time Lords were to be detached. Time Lords can't interfere, only watch. Time Lords weren't supposed to show emotion. Time Lords were all of these things. He was not.

The Doctor was different than other Time Lords. He followed the rules at first. He did his duties and respected those above him. He even had a family or as close as one could get on Gallifrey. He had a wonderful Time Lady for a wife, beautiful loomed children, and grandchildren too.

As time went on, things changed. He started to rethink the rules and ask if things were really necessary. He became more compassionate, more rebellious, and more restless. He took the name, the Doctor, because of his desire to help people. The life of a Time Lord didn't hold as much desire as it once had.

It became harder to be detached. He was already attached to his family and the Gallifreyan Council had no problem with that. His human instincts started to rise up. As he saw the people being affected by his and his people's actions, he thought that some of their fates were unfair and unjust.

Interfering became a thing that he wanted to do more. As he observed, his observations made him think over what was right and what was wrong. Sometimes he felt like just bursting in on the scene and helping the poor person or people from where their timeline directed them.

Being part human, suppressing his emotions was not easy. On the job, his face was emotionless and nothing showed. On occasion though, his emotions showed through his eyes and a twitch or two. His superiors, if they noticed, reproached him and told him he was better than that. They told him to keep better control over his emotions. When he got home, his emotions flooded over him and if he had a really depressing day glancing at people's timelines, he would start to cry. His wife knew his inner turmoil and tried to help him as best he could. He was grateful to her for that. Still his human-like thoughts grew, no matter how hard he tried to restrain them.

It all changed when he saw her. She was the most beautiful TARDIS he had ever set eyes upon. That TARDIS was battle-scarred, but still beautiful. It seemed like destiny when he set his eyes upon the ship who would become his partner for many hundreds of years.

Ever since he was little, he imagined himself piloting a TARDIS into space, seeing new worlds, new people, and new things, The nights before he entered the Academy were spent under the stars looking up to space. He would see TARDIS' fly off and wish he was one of the Time Lords piloting it. Even in the Academy, he still wanted his own TARDIS. Sure he got to learn how to fly one, and later fly one himself alone and with other Time-sensitive Gallifreyans. But he still wanted to have one to call his own and bond with. He didn't care that he failed his piloting lessons. The desire was still there. Now there was one just begging to be taken into Time and Space.

So he took her away with his granddaughter's help. He became the renegade Time Lord. He became the stuff of legends. He was the Oncoming Storm. He was the Doctor.