Neither of Iikka's parents are psychics, and there are no psychics amongst any of his extended family. He was born more or less exactly as had been predicted on December 12th, with no complications, and for the first few months of his life was unremarkable from a regular child in every way. On April 5th of the following year (144 days later), there was a break-in at the Guiomar residence, although the miscreant did not appear to take anything and left before they could be apprehended. From that point on however, close friends of the Guiomars saw that the two parents were treating their child with extreme coldness and distance. There were several times in his early life where Iikka was almost taken by child protection services and placed in foster homes when neighbors almost reported the neglect displayed by his parents. Iikka's saving grace was that his parents allowed others to take care of him, preferring for him to be out and about with other children with parents of their own who could keep a close eye on him. To this extent, Iikka developed very emotional attachment to either of his parents in his early life, but otherwise retained a relatively normal childhood and education.
During middle school, Iikka suffered from aggravated social anxiety - having spent most of his early childhood with a small set of neighborhood friends, a public school environment did little for his comfort. He performed on-and-off, often described by teachers as 'not knowing what to do with himself,' with straight perfect scores in English and associated courses that were constantly dismissed. As he grew, more and more anomalous 'incidents' occurred around him, with teachers and students labeling Iikka as a troublemaker and ostracizing him.
For a five-year period, Iikka went entirely without any friends beyond the occasional guidance counselor who would pull him into their offices to talk about his apparent disruptive behaviors, and with most children avoiding him. Over time, he found ways to preoccupy himself, mainly through writing. For him, it was an escape as well as an art - to him, writing was not about the meaning inherent to the story, but rather merely about creating. He viewed worlds he wrote as real, characters he made as alive, and so for the duration of his later middle-school years he was a fairly happy and well-adjusted (if lonely and listless) child.
When Iikka turned 16, his powers of illusion fully manifested. When previously they had only occurred sporadically and without much input on Iikka's part, now they came effortlessly and easily to him. Of course, while Iikka had a great degree of control over his powers, his ability to /use/ them was still somewhat lacking. His first illusions lacked color, and he has difficulty making illusions solid or in having them registered by senses other than sight. His school immediately informed the Institute for the Exceptionally Gifted as his status as a psychic and informed his parents as soon as Iikka's powers became obvious.
His parents were only too eager to get him as far away as possible from them, and had apparently been waiting for such an opprotunity. The very same day they received a letter from the institute informing them of the possibility that Iikka could be enrolled, they had woken him up early, having already packed all of his luggage and possessions while he slept, and shipped him off without so much as asking him what he thought of the matter. Iikka did not even know where he was going until he was already at the Institute.
Since joining the institute, Iikka has made a small number of friends, and in the supportive and fantastical environment of the school, surrounded by students just like him, he has grown and matured considerably.