Tsuki is a quiet individual, often able to be found in a more secluded area of the school grounds, appearing usually to be deep in thought, or lost in his music, though despite that, it isn't always the fact of the matter. Despite being what people may call a "loner", he is quite friendly if you can manage to get him to open up enough, and easily approached, yet during first meetings he can appear quite shy, or even awkward. In short, to describe his personality in as few words as possible, Tsuki is quiet, approachable, shy, and rather intelligent when needs be.
Tsuki led a normal life up until around the age of six or seven, when his mother and father became divorced, his father gaining custody of him which resulted in his transferring schools. He had never found it easy to make friends with the other children, meaning that once he had become separated from his friends, he never really made any new ones. Having spent so much time alone, he has had more time to study and read than most his age have, leaving him to be rather intelligent, though he won't show it unless he has to, for example if put on the spot in class. At the age of nine, he gained an unshakable fear of dogs after being attacked by the neighbor's bull terrier, quite a considerable amount of physical scarring being gained in the process (as mentioned in appearance description). Since then, he became more timid around boisterous people, and considerably more jumpy. Aside from the above not much is left to say, and should be learnt along the way if Tsuki cares to tell.