Age 1: A while after his birth, it was not only noticed that he was frail, and a bit weak, but he was strange. A wizard was asked to help him, but in return, the wizard would be allowed to use mysterious, and ancient magic. This led to his ears, and how his senses work. This is why he has ears the size of babies! Surprisingly, this isn't why his eyes change colors rapidly....
Age 2: Ever since the change, his family, as told to by the wizard, began to nurse him on slightly poisoned blood, and pure blood, from an animal, preferably fish or live stock. He was also fed strange things (Not at all strange in his perception, nor, strange compared to the other parts of his diet!), such as herbs and wild mushrooms, some slightly poisoned him.
Age 3: He is still fed blood, wild herbs, wild mushrooms, and other strange foods. He can now walk, and it was noticed that he tried to interact with others. The local, violent children, would often harass him, or injure him, which gave way to his regenerative abilities (Well, more of, it revealed his regenerative abilities, to where, it was easily noticed that if he had a large cut, it would be gone within a day maximum).
Age 4: Talks more, and better than all the other local children his age. He eats a large amount of what he previously ate, and is now eating more, interesting things. He interacts with local animals well, very friendly to them. He didn't fight back, despite the violence of the children around him. This was also the time his claws began growing in.
Ages 5-7: Became quite lonely, cynical, and was often the target of many of his peers. He began to avoid others, most of the time. Sometime during age six, he discovered necromancy thanks to a necromancer he met. He cared for many animals, such as bunnies. At age seven, after one of the bunnies died of natural causes, he got help from the necromancer, and it was brought back from the dead.
Ages 8-10: Became more cynical, critical, negative, and a bit more evil in some ways. He lost his temper, and destroyed several homes with a combination of dark magic/necromancy, and his claws. By now, he had become, the necromancer's apprentice. He left his home town, to live in the woods with the necromancer. By age ten, he had learned to control zombies, bring the dead back to life, control dummies, make dummies, and use various ingredients to make poisons.
Ages 11-13: At age eleven, he became a full fledged necromancer, not only knowing several advanced spells, but how to summon demons, monsters, and various paranormal creatures. He later, at age thirteen, after finishing a small 'army', of dummies, zombies, and weak monsters, he destroyed a large portion of his village, mostly killing his potential enemies, their family, but he did let a large portion of the village escape, and soon after, he set the remains of the ruined village, either on fire, or, some of it began to be used as a haven for wild life. This proved that even while destroying an entire village, killing at least half it's populace, it's remains were taken back by nature, and used for good, showing that he has a heart. Once ruins he had set fire to had burned to cinders, he began making sure the correct plants were planted to ensure the area would be perfect for the wildlife. He disbanded his army by letting the zombies die again, giving the dummies the duty of caring for the entire area, and, he 'sacrificed' the weak monsters, via persuading them to allow him to sacrifice them. He had figured out that the weak monsters made their bodies less dense, and it made them appear larger and stronger, but in truth, they were weaker then they looked. After the sacrifice, they formed into one, small, yet incredibly powerful monster. The monster is tiny, almost capable of being held with one hand, this monster often influences his decisions, and his judgement.
Ages 14-19: He began traveling all over, surviving mostly by using his abilities. Whilst traveling, he began to raise the monster, and throught time, it barely changed size. He did good, and yet evil throught time, but most of it was considered evil.

He can be a bit naive, and sometimes trusts others too easily. He does his best to be polite. He can be described sometimes as 'too kind', as he often takes care of animals, is often a bit too logical or rational, and thinks a bit too much.