Supernatural or Human?:
Temperature Control. Mark can with some difficulty depending on the size and material of an object, control the temperature of it. He must be in physical contact with the object and heat is slowly added to it or taken away at about a rate of a one Celsius per second. (It would take him around 80 seconds to boil water at room temperature.)
Reason for Probation:
Mark has a very bad control over his power, which usually doesn't affect his everyday life too much, as his power takes so long to actually cause serious harm, but one day when Mark was at his local swimming pool, he may have almost brought the swimming pool to a boil. He was quickly apprehended and put on probation in order to make sure that he wasn't setting people on fire, or freezing them by accident. His control over his power is now slightly better, but when tired or in heighten emotional states his power does tend to rum rampant.
Mark is quite possibly one of the loudest people in the room at all times. He is hyper and jumpy and will not hesitate to walk up to a perfect stranger in order to say "Hello! How are you? I'm fine, isn't the weather great today?". In fact sometimes Mark can be a little too friendly, as he loves to shake hands with people, but his power can hurt them without him realizing. He's quite air headed but if told to focus or stop joking around for a good reason he'll be the first person to stop talking as he hates conflicts.
Mark grew up in a middle class family as an only child. His parents were perfectly normal in every way you could think of, except for one odd quirk. They had a weird infatuation with gardening. Mark lived in a medium sized house, with a large back yard that was almost entirely converted into a different vegetable plants. His basement was filled with sun lamps and different plants and year round Mark would feast on fresh vegetables. Oddly enough his family had no fruit trees or plants as they were "too easy to grow and there was no point in having them". Mark did not take to this odd infatuation as much as his parents would like, he did learn how to care for plants and was rather skilled at it, but he had this odd tendency to want to play video games and sports rather then weed and water plants. You could say this was a bit of a point of contention between Mark and his parents.
Aside from that however Mark earned slightly below average grades, he was slightly above average athletic wise, and could also change the temperature of anything he touched. Needless to say there were dozens of plants that died from frost in the middle of summer before Mark realized what he could do. Of course all he really used is power for at first was to make his drink cold and keep his bed at a perfect temperature, but as puberty hit, his control over his powers almost dissipated. To add on to his misfortune his powers also increased in power, and simple tasks like cooling a drink was giving him blocks of ice instead of refreshing ice cold water.
It was then that one fateful day his powers were discovered when he nearly created a stew out of the people at his local swimming pool. He was quickly apprehended and then when telling them how he couldn't quite control his powers, and he was not trying to cook everyone else at the pool with him, they put him on probation.