Overview
Kamitsuki (かみつき) is the protagonist of the fangame Dreams, Delusions after all (夢、所詮妄想) by へなちょこ. The gender of Kamitsuki is not been stated officially, but mostly be interpreted as a boy. In the followings will use "he" to Kamitsuki as for convenience.
He locks himself in his room for unknown reasons and attempts to escape that reality by either reading or writing on the notebook on his desk. The world inside that notebook is filled with fantasy characters such as vampires, robots or angels, however it also has violent and dangerous worlds which seem to have some reality struck to him.
Appearance
Like Madotsuki and many others, his eyes are always closed in-game with the exception of some animations like the black page one or the white page one where you can see his eyes as red. He has short messy hair similar to Sabitsuki's but black instead of white.
He wears a long sleeve white shirt with a black pattern on it, black pants and brown shoes. The shirt's design is most likely an X mark similar to the shape of the band-aid item, since that specific effect seems to be important in the plot, but could also just be following the trend of window-like symbols.
Personality
Right when you start the game, next to Kamitsuki's name his job description says "chuunibyou (中二病)" which is basically a summarized description of the behavior you usually see in little kids and teenagers where they pretend to know everything and act like outcasts on purpose.
By the time you collect all of the effects and then trigger an event, his job description changes to "utsubyou (うつ病)" which means depression, causes appearance of the dream world creepy.
Besides that, the world he sees also reflects a little on his personality. Some of the worlds and effects show his mental weakness and his confusion towards sexual behaviour and possibly women. Many worlds are also very child-like or playful, such as the Video Game World, Curry World or Dessert World.
The strongest emotion he seems to feel is rejection against his own family which can be seen in the map where his whole family is together yet most of the text in the ground says "I don't need them" and some even say "die".
Past
Kamitsuki seemed to be close to his family at some point, but then turned against them. In one of his dreams a woman (possibly his mother) strokes his head when the band-aid effect is equipped. Kamitsuki could possibly mean that he still want to be mothered, or was mothered for most of his life.
Other Game Appearances and References
Debris
A sign in the fangame room has Kamitsuki's signature shirt design.
DreaMarbleng
One of the easels in the fangame gallery has a painting with Kamitsuki's shirt design.
Hallucigenia
A doormat with Kamitsuki's shirt design can be found in one of the worlds.
Me
One of the paintings in the fangame gallery has Kamitsuki's shirt design.
Physicality
A picture of Kamitsuki's outfit can be found in the fangame reference stairway.
Remegeton
A picture of Kamitsuki's outfit can be found in the fangame reference room.
Sick Mind
A doll of Kamitsuki can be found in the fangames reference room.
Somnium
Thomas has a sprite with Kamitsuki's hair and outfit colors.
UBOK.
A screen/painting of Kamitsuki's outfit can be found in the fangame reference gallery.
Yume 2kki
Kamitsuki's outfit can be found in Urotsuki's dressing room.